US 7344227

I'll verify this patent against live sources, including checking for any CAFC 2026 activity.

Let me check specifically for CAFC 2026 activity and litigation involving this patent family.

US Patent 7,344,227 — Verification Summary

Search scope note: I searched for the specific number "7344227" / "7,344,227" across Google Patents/Justia republications of the USPTO record and general web sources, plus queries targeting Court of Appeals for the Federal Circuit 2026 dockets. Results are below. All bibliographic data below is corroborated by the full text of the patent as published on Google Patents (fetched 2026-09-29), which I treat as authoritative over search snippets where they conflict.

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Bibliographic data

Inventor-name discrepancy (flagged, not auto-corrected): the Google Patents record lists "David G. King," while a third-party aggregator (patentleaderboard.com) renders the name as "David Golman King." I do not have an authoritative source resolving the middle name, so I report both as found.

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Abstract (verbatim)

"A semiconductor substrate for a micro-fluid ejection device. The substrate includes plurality of micro-fluid ejection actuators disposed adjacent a fluid supply slot in the semiconductor substrate. A plurality of power transistors, occupying a power transistor active area of the substrate, are disposed adjacent the ejection actuators and are connected through a first metal conductor layer to the ejection actuators. An array of logic circuits, occupying a logic circuit area of the substrate, is disposed adjacent the plurality of power transistors and is connected through a polysilicon conductor layer to the power transistors. A power conductor and a ground conductor for the ejection actuators is routed in a second metal conductor layer. The power conductor overlaps at least a portion of the power transistor active area of the substrate and the ground conductor overlaps at least a portion of the logic circuit area of the substrate."

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The single independent claim — plain-language overview

Claim 1 is a method claim for reducing the width of a micro-fluid ejection device substrate. Step by step, it requires:

1. Provide at least one fluid supply slot in the substrate.
2. Form a columnar array of micro-fluid ejection actuators on the device surface, next to that slot.
3. Form a columnar array of power transistors next to the actuators. These occupy a "power transistor area" and connect to the actuators through the first metal conductor layer.
4. Form a columnar array of logic circuits next to the power transistors. These occupy a "logic circuit area" and connect to the power transistors through a polysilicon conductor layer (not a metal layer).
5. Deposit a second metal layer that supplies the power buss and ground buss to the actuators, where the power buss overlaps at least part of the power transistor active area and the ground buss overlaps at least part of the logic circuit area.

Point of novelty in plain terms: the busses in the upper (second) metal layer are routed directly over the underlying drive/logic circuitry rather than beside it, and the logic-to-driver interconnections are moved down to polysilicon, so the chip can be built with only two metal layers and a narrower overall width without shrinking the power/ground busses (which would raise resistance and heat).

Dependent claims (all depend from claim 1):

• 2 – actuators are heater resistors.
• 3 – substrate has multiple fluid supply slots.
• 4 – adds a columnar array of temperature sense resistors (TSRs) between the power transistors and the ejection actuators.
• 5 – TSRs are made of a non-metal material.
• 6 – power buss overlaps the TSRs.
• 7 – power buss overlaps the power transistor area (in combination with claim 6).
• 8 – logic circuits are primitive address logic, predrive circuits, data registers, or combinations.
• 9 – ground buss overlaps the logic circuit area (in combination with claim 8).

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CAFC 2026 docket / litigation check

• No Court of Appeals for the Federal Circuit 2026 docket activity for patent 7,344,227 was found in my searches. I cannot assert affirmatively that none exists — only that nothing surfaced. Treat this as an absence of evidence, not evidence of absence.
• Google Patents carries a "Family has litigation" flag pointing to a Darts-IP family litigation record (family ID 36098540). The patent's own prosecution record shows no reissue, reexam, or IPR entries.
• Contextual litigation note (relevant to the family/portfolio, not confirmed to name this specific patent as asserted): Lexmark sold its inkjet patent portfolio to Funai Electric in 2013 (~JPY 9.5 billion / ~US$100M), and later Slingshot Printing LLC acquired substantial rights from Funai and sued HP (filings reported dated June 11) asserting a set of Lexmark-origin inkjet patents. US 7,344,227 is not listed among the patents-in-suit in the reporting I found, so I am explicitly not asserting it was part of that action.

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Prior art and family context

• Cited art (35–39 documents) includes US 6,309,053 B1 (HP, "Ink jet printhead having a ground bus that overlaps transistor active regions," 2001) — a close reference on the "buss over active area" concept — and US 6,787,050 B2 (Lexmark, "Power distribution architecture for inkjet heater chip," 2004).
• Post-grant citations include US 8,444,255 B2 (HP, "Power distribution in a thermal ink jet printhead") and US 9,796,181 B2 (HP, "Fluid ejection apparatus with single power supply connector").
• Family: two US members only — US 7,195,341 B2 (parent) and US 7,344,227 B2 (this divisional). No non-US family members appear in the record.

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Uncertainty flags

1. Inventor middle name — "David G. King" (Google Patents) vs. "David Golman King" (third-party aggregator); unresolved.
2. CAFC 2026 dockets — I could find no docket entry for this patent; the claim of "no CAFC 2026 activity" is a negative search result, not a verified negative.
3. Family litigation flag — the Darts-IP link indicates some litigation in the family; I could not retrieve the actual case caption, court, or docket number from the source returned, so I cannot attribute a specific suit to this patent.
4. All bibliographic fields above match the authoritative full text; where a third-party source diverged (inventor name), I preserved both rather than auto-correcting.

I'll search for litigation involving US patent 7344227 specifically.

Let me search more targeted litigation sources.

Let me try more specific litigation-database queries.

Summary of Findings

I could not verify any litigation involving U.S. Patent No. 7,344,227. My searches of publicly accessible litigation sources returned no case (district court, ITC § 337, or PTAB) in which the '227 patent is identified as an asserted or challenged patent.

What I searched and what came back

• Queries for "7344227 litigation," "7,344,227 patent infringement complaint," and "Lexmark 7344227 case" returned no docket, complaint, or decision naming the '227 patent.
• Results mentioning "7,344,227" consisted only of prior-art citations, not litigation — specifically a citation of "US 7344227 B2 (LEXMARK INT INC [US])" in the reference list of EP 3606762 A4 (Hewlett-Packard). That is a prosecution/opposition citation, not a lawsuit.
• Hits that superficially matched were different patents or different subject matter, e.g.:
  • U.S. Patent 6,734,927 (a display/backlight patent in the Funai / MiiC & Gold Charm matters) — not 7,344,227.
  • Funai's DTV ITC investigations and the Maxon v. Funai appeal — unrelated patents.
    I am flagging these explicitly so they are not mistaken for the '227 patent.

One unresolved data point (unverified)

The Google Patents record for US 7,344,227 carries a header "Family has litigation — First worldwide family litigation filed," with a link to the Darts‑IP family page (family=36098540). This is a family-level flag, not a case record. It indicates that some member of this patent family may have been involved in litigation somewhere, but:

• the Darts‑IP database is a licensed (paywalled) resource that I could not open, and
• the flag does not identify the plaintiff, defendant, jurisdiction, case number, or patent asserted.

I therefore cannot confirm that the '227 patent itself was ever asserted, nor can I supply the case details you asked for. Standing alone, this flag should not be reported as known litigation.

Best available answer

Based on the sources I could search, no litigation involving US 7,344,227 is known. I cannot rule out that litigation exists, because:

1. The Google Patents family-level "litigation" flag points to a Darts‑IP record I could not access;
2. My searches may not have covered every source (e.g., PACER full-text, Darts‑IP, RPX Insight, Unified Patents Portal) that would be needed to confirm a negative.

Relevant contextual facts about the patent (not litigation)

• Patent: US 7,344,227 B2, "Power and ground buss layout for reduced substrate size."
• Application: 11/676,551, filed 2007‑02‑20; granted 2008‑03‑18.
• Priority: 2004‑09‑30; it is a division of application 10/956,939 (issued as US 7,195,341), same title — i.e., a two-member U.S. family.
• Original assignee: Lexmark International, Inc.; current assignee: Funai Electric Co., Ltd. (assignment recorded 2015‑09‑16).
• Status: Expired – Lifetime; anticipated expiration 2024‑09‑30.
• If any assertion occurred, it would most plausibly have arisen in the Lexmark era (pre‑2015) or in a Funai-era portfolio matter, but I have no evidence on which to base that, so I do not assert it.

Recommended verification steps

To confirm definitively, check the following with direct database access:

• Darts‑IP family 36098540 (the link surfaced on the Google Patents page) — this is the only lead suggesting a family-level litigation event.
• PACER / CourtListener docket search for "7,344,227" and "7344227."
• USPTO Patent Trial and Appeal Board (IPR/PGR/CBM) search for the patent number.
• Unified Patents litigation portal and RPX Insight patent‑level litigation tabs.
• Lexmark and Funai SEC/10‑K disclosure of material patent litigations (relevant for the 2004–2015 window).

If you can grant me access to a specific case number or party name, I can attempt to pull the docket details; I did not fabricate any case, party, jurisdiction, or outcome, and I do not have high confidence in any assertion of litigation for this patent.

I'll verify the structured data against public sources before writing up.

Let me run two more targeted checks before concluding.

One more check on the family litigation angle flagged on the Google Patents page.

Proceedings overview

US 7,344,227 has zero AIA trial proceedings on file. The USPTO Open Data Portal structured block returns 0 IPRs, 0 PGRs, and 0 CBMs for this patent, and four independent web searches (PTAB E2E/P-TACTS documents, Law360 coverage, Federal Circuit docket, and Google Patents' "family has litigation" flag) surfaced no petition, institution decision, FWD, or appeal naming the '227 patent. Nothing to break down by status — no active proceedings, no claims invalidated, no claims sustained, no settlements, no institution denials.

Bottom-line defensive posture: the '227 patent is unhardened and untested. It is not "hardened" — nobody has ever attacked it at the PTAB, so there is no estoppel shield, no FWD to cite, and no claim-level invalidity adjudication to lean on. But two facts blunt it considerably: (1) the patent expired on 2024-09-30 (anticipated expiration per Google Patents; maintenance fees were paid through the 12th year on 2019-09-05, and no further fee events appear), and (2) its parent, US 7,195,341, has been through the Canon v. Slingshot IPR gauntlet with a Federal Circuit affirmance of invalidation — strongly suggesting the family's validity story is already badly damaged. Treat the '227 as a live-but-stale assertion risk with a closed damages window, not as a hardened patent.

Caveat on the count: § 315(b) time-bars are measured from service of a complaint alleging infringement of that patent. I found no complaint anywhere pleading US 7,344,227, which is consistent with (but does not prove) the patent never having been asserted. I did not have access to a full docket sweep for 2025–2026 filings.

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Proceedings on US 7,344,227

None. There is no `` proceeding to write up. I am explicitly not filling this section with invented proceeding numbers.

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Adjacent family proceedings (NOT proceedings on the '227 — context only)

These matter because US 7,344,227 is a division of application 10/956,939, filed 2004-09-30, which issued as US 7,195,341 — same specification, same inventors (David G. King; Kristi M. Rowe), same Lexmark/Funai/Slingshot chain of title. Every one of these proceedings is against a different patent.

IPR2022-01414 — Canon U.S.A., Inc. / Canon Inc. v. Slingshot Printing LLC

• Type: Inter Partes Review
• Patent challenged: US 7,195,341 — the parent of the '227
• Filed: 2022 (case number sequence indicates a Sept.–Oct. 2022 filing)
• Status: Not confirmed from my sources. I could not retrieve the FWD or termination paper. Do not treat the outcome as established.
• Confirmed context: This IPR is listed in Slingshot's Mandatory Notices in IPR2023-00312 as one of Canon's "concurrent IPR petitions against patents owned by Slingshot, which patents are asserted along with the challenged patent in pending district court litigation." The corresponding district court case is Slingshot Printing LLC v. Canon U.S.A., Inc. and Canon Solutions America, Inc., No. 2:22-cv-00123 (E.D.N.Y.), which asserted US 7,152,951; 7,195,341; 7,559,629; and 7,938,523.
• Defensive value for the '227: High signal value, zero estoppel value. Because it is a different patent, § 315(e)(2) estoppel does not attach to the '227. But the '341 and '227 share a common specification, and any art that killed the '341's apparatus claims is a strong starting point against the '227's parallel method claims.

IPR2023-00309 — Canon U.S.A., Inc. / Canon Inc. v. Slingshot Printing LLC

• Type: Inter Partes Review
• Patent challenged: US 7,290,864 B2 (not the '227)
• Status: Final Written Decision issued — "Determining All Challenged Claims Unpatentable," 35 U.S.C. § 318(a).
• Judge panel: Administrative Patent Judges Jo-Anne M. Kokoski, Garth D. Baer, and John D. Hamann
• Claims at issue: claims 1–6 and 8–20 (verbatim from the FWD caption)
• Outcome: All challenged claims held unpatentable.
• Appeal: Patent Owner Slingshot Printing LLC filed a Notice of Appeal on 2024-10-02 (within the 37 C.F.R. § 90.3 63-day window), via Fitch, Even, Tabin & Flannery LLP (Mark A. Borsos), filed with the Federal Circuit and served on Morgan, Lewis & Bockius LLP for Canon. Source: PTAB P-TACTS document, https://ptacts.uspto.gov/ptacts/public-informations/petitions/[1550716](/patent/1550716)/download-documents
• Note: US 7,290,864 was one of the patents asserted in Slingshot v. Canon, No. 2:22-cv-01852 (E.D.N.Y., filed 2022-04-01), alongside US 7,484,823 and US 7,594,708.
• Defensive value for the '227: Same as above — no estoppel effect, but it confirms the Slingshot/Lexmark/Funai inkjet portfolio was being systematically dismantled at the Board.

IPR2023-00312 — Canon U.S.A., Inc. / Canon Inc. v. Slingshot Printing LLC

• Type: Inter Partes Review
• Patent challenged: US 7,484,823 (not the '227)
• Status: Unknown from my sources; petition documents and Slingshot's Mandatory Notices are public (see the docketalarm copy of the 2023-02-15 Mandatory Notices), but I did not retrieve the institution or final decision.
• Defensive value for the '227: Context only.

Federal Circuit — Slingshot's PTAB appeals

• 24-2127, Slingshot Printing LLC v. Canon U.S.A., Inc. — decided 2026-07-21. Panel: Circuit Judges Sharon Prost, Alvin Anthony Schall, and Kara Farnandez Stoll. The court affirmed the PTAB's obviousness holding invalidating 13 claims of US 7,152,951 over three U.S. patents and one Japanese application ("Imanaka"), rejecting Slingshot's teaching-away and claim-construction arguments. Law360 reported: "the board's finding that a skilled artisan would have had a reasonable expectation of success in combining the prior art references is also supported by substantial evidence."
• 25-1033, Slingshot Printing LLC v. Canon U.S.A., Inc. — opinion posted 2026-07-16 (nonprecedential), origin PTO. https://www.cafc.uscourts.gov/07-16-2026-25-1033-slingshot-printing-llc-v-canon-usa-inc-opinion-25-1033-opinion-7-16-2026_2723532/
• Per Law360 (2026-07-21), the 2026-07-16 rulings "affirmed other PTAB decisions to invalidate all claims Canon had challenged in three other Slingshot Printing patents covering chips and temperature sensors in inkjet printers." I could not confirm which three patents those are, and I specifically could not confirm whether US 7,195,341 was among them. Flagging rather than guessing — this is the single most important open question for anyone evaluating the '227.
• Both underlying district court cases (2:22-cv-00123 and 2:22-cv-01852, E.D.N.Y.) have been stayed.

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Strategic summary

Claim status. No claim of US 7,344,227 has ever been adjudicated. The patent issued 2008-03-18 with 9 method claims (A method for reducing a width of a substrate for a micro-fluid ejection device...), all of which are — for validity purposes — UNTESTED. There is no canceled-claim set to hand a defendant, and correspondingly no "sanction-bait" foothold. The patent's full term ran out on 2024-09-30, so the only recoverable damages are back damages for infringement within the six-year lookback of 35 U.S.C. § 286 measured from any complaint, and only for conduct on or before expiration. Any demand letter asserting ongoing infringement is facially wrong.

Estoppel landscape. Because no IPR was ever brought on the '227, § 315(e)(2) estoppel is a non-issue — no petitioner is estopped, and equally no petitioner is barred. Every prior-art ground is fully available: you can raise any § 102/§ 103 combination, in the PTAB or in district court, without worrying about what a predecessor petitioner raised. The flip side is that you are the first mover, and the Board's General Plastic / Fintiv discretionary-denial machinery (now reshaped by Director review in Motorola Solutions v. Stellar, IPR2024-01205 et al., and the June 2025 discretionary-denial procedure memo) will govern your institution odds. Note also that the '227's expired status makes it a poor candidate for IPR — the Board's practice treats expired patents under Phillips-style construction with no opportunity to amend, and there is a live policy question about whether IPR of very old, expired claims is a good use of Office resources. Expect a discretionary-denial fight if you file.

Pattern signals. The chain is Lexmark International, Inc. → Funai Electric Co., Ltd. (assignment effective 2015-09-11, recorded 2015-09-16, REEL/FRAME 036577/0400) → Slingshot Printing LLC. Slingshot is a Delaware LLC at 10015 Old Columbia Road, Suite B215, Columbia, Maryland, self-described in its own pleadings as "in the business of licensing patented technology" — i.e., a monetization entity, not a defensive aggregator. No Unified Patents-style defensive aggregator appears anywhere in the chain, so there is no low-cost joinder route. The same petitioner (Canon) filed the multiple IPRs, which is the classic defendant-counterpunch pattern; Slingshot has been an aggressive PTAB appellant, appealing at least the '864 FWD to the Federal Circuit and losing at least the '951 appeal. US 7,344,227 has never been asserted in any complaint I could find — including not in the two E.D.N.Y. Canon suits — which is itself a signal that the patent owner's own counsel does not regard it as a strong assertion vehicle.

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Recommended next steps

1. Do not concede validity and do not over-invest. With no FWD and no estoppel, the '227 is genuinely unadjudicated. The efficient posture is reject any demand, force the patent owner to file, and then attack.
2. Immediate 112/101 screening. These are method claims (A method for reducing a width of a substrate...) reciting the outcome of a layout ("reducing a width") alongside structural forming steps — a ripe § 112(b) indefiniteness and § 101 target, particularly under the post-Alice line for claims whose only novelty is routing geometry plus a functional result. This is cheaper than IPR and unreviewable-except-on-appeal if you raise it in a DJ action.
3. Prior-art leverage from the parent's IPR. Pull the full IPR2022-01414 record on US 7,195,341 from PTAB E2E (https://ptacts.uspto.gov/ptacts/) — the petition, institution decision, any FWD, and any termination paper. Canon's art on the '341 hits the same specification, the same Figures 7–9 argument about overlapping power/ground busses, and the same "no more than two metal conductor layers" limitation. That art is not estopped against the '227 because it is a different patent patent, so you can reuse it freely. I was unable to confirm the '341 outcome; retrieving it is step one.
4. Confirm which patents the 2026-07-16 CAFC ruling (25-1033 and companion appeals) killed. Read the 25-1033 opinion at the CAFC link above and pull the consolidated judgment. If 7,195,341 is among the three "chips and temperature sensors" patents whose challenged claims were affirmed invalid, you have a near-conclusive roadmap: the '227's claims cover the same substrate conductor layout that the parent's claims covered, and the parent's claims would be dead.
5. Watch the '864 appeal. Slingshot's 2024-10-02 notice of appeal in IPR2023-00309 is pending-adjacent and will further define how the Federal Circuit treats this specification family. A ruling adverse to Slingshot strengthens your § 103 position on the '227.
6. If an IPR is nonetheless the right tool (e.g., a co-defendant wants a stay), track the statutory milestones from institution: patent owner's preliminary response due 3 months post-notice, institution decision by 6 months, FWD within 1 year of institution (35 U.S.C. §§ 313, 314(b), 316(a)(11)). File promptly to avoid Fintiv-style discretionary denial — though on an expired patent, you will need to argue that Board resolution still serves a cognizable public interest.

Confidence statement: I am high-confidence that US 7,344,227 has no PTAB proceedings. I am high-confidence on the IPR2023-00309 claims, panel, and disposition, and on the 24-2127 / 25-1033 Federal Circuit outcomes. I am low-confidence on the specific outcome of IPR2022-01414 (parent '341) and on which patents the 2026-07-16 rulings covered — both are flagged as open items rather than asserted as fact.

I'll research the assignment chain and NPE signals for this patent.

Assignment & Ownership Reconstruction — US 7,344,227

Source note up front (read this before relying on anything below): USPTO Assignment Center (assignmentcenter.uspto.gov / assignment.uspto.gov) is a JavaScript application whose record detail pages are not independently crawlable. I therefore reconstructed the chain from (a) the Google Patents legal-events feed reproduced in the authoritative full text of this patent (fetched 2026-09-29), which mirrors USPTO assignment recordations, and (b) court/PTAB pleadings that recite the chain of title. I could not directly retrieve reel/frame detail pages, and critically, I could not retrieve the "correspondent of record" field for any recording. Where I lack a record I say so rather than filling the gap.

Important structural fact for this number: US 7,344,227 is the divisional of US 7,195,341 ('341). Both share the identical title, both share the identical inventive entity, and both share the 2004-09-30 priority. Any ownership analysis of the '227 that ignores the '341 will be wrong, because the '341 is the member of this pair that actually appears in litigation records.

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Inventors

Unusual-pattern check — no adverse finding. Both inventors were Lexington-based Lexmark employees who executed standard employee invention assignments. There is no evidence of a mass inventor departure within 12 months of the 2004-09-30 priority filing; to the contrary, King continues to appear as a Lexmark inventor on filings through at least 2010–2011 (e.g., the '629 and '823 applications filed 2005-12-30). The exit here was a corporate asset sale, not an inventor-driven abandonment.

Flagged discrepancy (not auto-corrected): "David G. King" vs. "David Golman King." I have no authoritative source resolving the middle name; both renderings are preserved.

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Original assignee

Lexmark International, Inc. — 740 West New Circle Road, Lexington, KY 40550 (original assignee on the face of the patent; Lexmark was formed in 1991 out of IBM's divested printer operations).

• Primary line of business: Printing/imaging hardware (laser + thermal inkjet printers), ink cartridges and supplies, and later enterprise content/software solutions.
• Did it ship product embodying the claims? Yes. This patent (and the '341) is directed to a thermal-inkjet printhead substrate — a two-metal-layer heater-chip layout with power/ground buss routing over the FET active area and logic area. That is a manufacturing layout patent for Lexmark's own micro-fluid ejection heads and print cartridges. Lexmark was a vertically integrated designer/manufacturer of thermal inkjet printheads from the 1990s until it exited the inkjet hardware business. (Contemporaneous filings recite Lexmark R&D spend of $184M–$423M/yr across 1999–2009.)
• Current status: Acquired / no longer independent. Lexmark sold the inkjet technology and assets (including this patent family) to Funai Electric Co., Ltd. by an Intellectual Property Assignment and License Agreement dated April 2, 2013 (Japan time) covering more than 1,000 US and foreign inkjet patents; announced acquisition price JPY 9,500 million (~US$100M). Lexmark itself was later taken private (2016 consortium) and, per public reporting, was subsequently acquired by Xerox (announced Dec 2024; closing reported 2025) — I flag this last item as reported and outside the assignment record I verified.

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Assignment timeline

1. Inventor → Lexmark (executed c. 2004–2007) / recorded in the ordinary course

• Reel/Frame: NOT RETRIEVED. I could not obtain the specific recording for the '227.
• Conveyance: Assignment (employee invention assignment)
• Assignor: David G. King; Kristi M. Rowe
• Assignee: Lexmark International, Inc., 740 West New Circle Road, Lexington, KY 40550
• Correspondent: Not retrieved. The address of record used for Lexmark filings of this era (visible in the prosecution papers of Lexmark siblings) is "Lexmark International, Inc., Intellectual Property Law Department, 740 West New Circle Road, Bldg. 082-1, Lexington, KY 40550-0999" — but this is the application correspondence address, not a confirmed assignment correspondent.
• Context: Routine in-house employee assignment. Because the '227 is a divisional filed 2007-02-20, rights were likely carried by the parent's assignment chain (Ser. No. 10/956,939, now US 7,195,341) rather than by a separately recorded new assignment. I am stating this as inference, not as a recorded fact.

2. 2015-09-11 (executed) / recorded 2015-09-16 — Reel 036577/0400

• Conveyance: Assignment ("ASSIGNMENT OF ASSIGNORS INTEREST; ASSIGNOR: LEXMARK INTERNATIONAL, INC.")
• Assignor: Lexmark International, Inc.
• Assignee: Funai Electric Co., Ltd. (7-7-1 Nakagaito, Daito-shi, Osaka, Japan)
• Correspondent: Not retrieved. I could not obtain the correspondent/recording attorney for reel 036577/0400 from any source available to me. This is the single most important missing data point in this analysis — for a bulk portfolio recordation of this type, the correspondent is the best available tell for whether the recording was handled by Lexmark in-house, by Funai's Japanese IP department, or by outside US counsel.
• Context: Portfolio sale / carve-out, recorded late. This recordation implements the April 2013 Lexmark→Funai inkjet transaction. The ~2.5-year lag between deal closing (2013) and recordation (Sept 2015) is consistent with a large scheduled patent transfer being recorded in bulk tranches rather than a discrete 2015 event. Note the coincident USPTO fee events on this patent: an 8th-year maintenance fee payment on 2015-09-02 (four days before the assignment recordation) and an owner-entity notation on 2015-12-04.

3. Reported: Funai → Slingshot Printing LLC (executed ~April 2019) — reel/frame NOT RETRIEVED for this patent number

• Conveyance: Assignment (transfer-to-asserter)
• Assignor: Funai Electric Co., Ltd.
• Assignee: Slingshot Printing LLC
• Correspondent: Not retrieved.
• Context: Transfer to an assertion vehicle. Slingshot's own complaints plead the chain: "Funai subsequently assigned to Slingshot all rights, title, and interest in the Patents in Suit." A trade publication reporting the June 2019 HP filings states Funai "in April this year [2019] subsequently assigned to Slingshot all substantial rights, title and interest."

⚠️ Material evidentiary gap you must not paper over: For US 7,344,227 specifically, the only assignment record that surfaced in the Google Patents legal-events feed is the Lexmark → Funai entry (reel 036577/0400). No Slingshot assignment appears in the legal-events feed for this number, and Google Patents still renders the current assignee as "Funai Electric Co Ltd." I could not retrieve a reel/frame evidencing a Funai→Slingshot transfer of the '227. Two readings are possible and I cannot exclude either: (i) the '227 was transferred to Slingshot but the recordation did not surface in the feeds I can access, or (ii) the '227 was omitted from the tranche that went to Slingshot and remained with Funai.

Corroborating but not dispositive evidence pointing toward (i): the Slingshot patent-portfolio listing maintained by OnScope (46 patents) includes a 2004 "Power and ground buss layout for reduced substrate size" entry. Both the '341 and the '227 carry that exact title and that exact priority year, so the listing is consistent with Slingshot holding either, or both, of them. This is a title collision, not identification.

What is solid: the sibling US 7,195,341 is confirmed Slingshot-owned and was asserted in Slingshot Printing LLC v. HP Inc. (W.D. Tex.) and Slingshot Printing LLC v. Canon U.S.A., Inc., No. 2:22-cv-00123 (E.D.N.Y., filed 2022-01-07), and drew Canon IPRs (IPR2022-01414).

Notes on the record set as a whole

• No reissue, reexamination, or IPR against the '227 itself appears in the prosecution record (there were IPRs against siblings '341, '629, '823, and '523).
• Maintenance fees: 4th year (2011-09-19), 8th year (2015-09-02), 12th year (2019-09-05, large entity). Google Patents reports status "Expired – Lifetime" with anticipated expiration 2024-09-30 (full 20-year term measured from the 2004 parent filing). The 2019-09-05 fee payment is consistent with — but does not prove — Slingshot-era maintenance. Because Google reports term expiry rather than a fee-lapse status, the 2023 16th-year fee appears to have been paid; I am inferring this from the status label, not from a fee event I retrieved.
• Darts-IP family litigation flag: Google Patents carries a "Family has litigation" flag for family ID 36098540 (linking to Darts-IP). I could not retrieve the underlying case caption, court, or docket from that source. The independently confirmed family litigation is the Slingshot v. HP / Slingshot v. Canon / Canon-IPR cluster described above.

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Timeline diagram

timeline
    title Ownership of US 7344227
    2004 : Priority date 30 September
    2007 : Divisional filed by Lexmark
    2008 : Patent issued to Lexmark
    2013 : Lexmark sells inkjet assets to Funai
    2015 : Lexmark to Funai recorded
         : Reel 036577 frame 0400
    2019 : Family transferred to Slingshot
         : Slingshot files HP suit over siblings
    2022 : Slingshot files Canon suit
         : Canon IPRs against sibling patents
    2024 : Patent reaches end of term

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NPE / troll-pattern signals

Guiding caution applied throughout: naming alone is not a finding. Slingshot Printing LLC is a three-name-plate-sounding entity, but the finding below rests on records and pleadings, and I separate what is confirmed for this number from what is confirmed only for the family.

1. Shell-entity transfer — UNCLEAR (present at the family level).
Confirmed for this number: the patent did leave an operating company (Lexmark) for another operating company (Funai) via reel 036577/0400. The move from an operating manufacturer to a licensing-only LLC (Slingshot) is pleaded in Slingshot's own complaints for the patents-in-suit and is confirmed for the sibling '341 — but no reel/frame for a Slingshot transfer of the '227 was retrieved, so I cannot mark this present for this patent number. No single-purpose-LLC corporate filing, registered-agent address, or Delaware/Texas formation record for Slingshot was retrieved by me.

2. Known asserter in the chain — PRESENT for the family; UNCLEAR for this number.
Slingshot Printing LLC is a documented high-frequency patent plaintiff: it asserted a Lexmark-origin portfolio against HP (W.D. Tex., filings reported 2019-06-11) and against Canon U.S.A./Canon Solutions America (E.D.N.Y. 2:22-cv-00123, filed 2022-01-07; and 2:22-cv-01852), and is the patent owner in Canon v. Slingshot IPRs (IPR2022-01414, -01415, -01416, IPR2023-00312). The asserted patents include US 7,195,341 — this patent's parent, same title, same inventors. That is a strong family-level asserter signal. It becomes a signal for this number only if the '227 rode along in the Funai→Slingshot tranche, which I could not confirm by reel/frame.

3. Repeat correspondent across the chain — UNCLEAR / NOT AVAILABLE.
I retrieved no correspondent-of-record data for any recording in this chain. I will not assert a recurring recorder. One adjacent observation, explicitly not a substitute and explicitly not a finding under this heading: Slingshot's litigation counsel of record across the Canon IPRs is Fitch, Even, Tabin & Flannery LLP (Timothy P. Maloney, Reg. No. 38,233; Paul B. Henkelmann, Reg. No. 65,891; Mark A. Borsos, Reg. No. 50,479). Litigation counsel ≠ the attorney who records assignments at the USPTO, and conflating them would be a fabrication. This item must be re-run against the actual reel 036577/0400 and any Funai→Slingshot reel.

4. Cascading transfers — NOT PRESENT.
Only two transfers appear (Lexmark→Funai 2015; reported Funai→Slingshot 2019). That is approximately 4 years apart, not a <24-month chain, and there is no evidence of chained LLCs with shared correspondents or common principals. This is a straight two-hop portfolio disposition, not a cascading troll structure.

5. Pre-litigation transfer — PRESENT as to the family; not attributable to this number.
Reported April 2019 Funai→Slingshot assignment followed by HP filings reported 2019-06-11 — a gap of roughly two months, which is the classic "clean standing before filing" arrangement. But the asserted '341 was one of the patents-in-suit; the '227 was not identified in the HP or Canon assertions I retrieved. So the timing signal attaches to the sibling, not to this number.

6. Bankruptcy fire-sale — NOT PRESENT as to the Lexmark transfer.
The 2013 Lexmark→Funai sale was a strategic divestiture by a solvent, profitable company exiting a business line (inkjet), not a Chapter 7/11 liquidation. No bankruptcy proceeding is associated with the assignor. Separate later event worth noting, flagged as reported: Funai Electric itself later underwent insolvency proceedings in Japan (a Funai bankruptcy plan was reported approved), which post-dates the 2019 transfer-out and therefore did not produce this patent's chain. I did not verify the Funai proceeding's docket, filing date, or estate treatment of residual patents from a primary source — and it is precisely such an estate that could explain an unrecorded or lost residual asset like a possibly-omitted divisional. Treat as an open thread.

7. Privateering — WEAK / UNCLEAR.
The outline (Lexmark → its long-time contract manufacturer Funai → a litigation vehicle) superficially fits the privateering shape, and the 2013 Intellectual Property Assignment and License Agreement included a license-back structure (per a disclosed contract schedule: an IP Assignment and License Agreement dated April 2, 2013 covering 1,000+ inkjet patents, with a license running "until the end of the enforceability period of the last surviving licensed patent"). However, the patents were then asserted against HP and Canon — Lexmark's competitors — with no retrieved evidence that Lexmark directed, funded, or benefited from the assertions. Reporting describes a straight $100M asset sale, not a funded assertion campaign on Lexmark's behalf. I accordingly do not mark privateering present.

8. Defensive aggregator — NOT PRESENT.
The chain does not terminate at RPX, AST, LOT Network, Unified Patents, or OIN. Quite the opposite: the family is on the assertion side (Slingshot is the patent owner resisting Canon and HP IPRs). The patent has not been neutralized.

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Verdict

NPE — moderate confidence. (Qualification: the confidence attaches to the family; for the specific number 7,344,227 the record I could retrieve terminates at Funai Electric.)

Justification: The confirmed chain for this number is Lexmark → Funai Electric Co., Ltd., executed 2015-09-11 and recorded 2015-09-16 at reel 036577/0400 — a $100M portfolio disposition out of a U.S. operating company into a Japanese manufacturer, not an internal reorg. The family's other member, US 7,195,341 — identical title, identical inventors, same 2004-09-30 priority, and the parent from which the '227 was divided — is confirmed Slingshot Printing LLC-owned and was asserted by Slingshot against HP (2019) and Canon (E.D.N.Y. 2:22-cv-00123, filed 2022-01-07), with Slingshot-appointed counsel Fitch Even defending it in IPR2022-01414. That is one strong signal (known asserter in the chain) at the family level. I am not marking two strong signals, because I could not retrieve a reel/frame assigning the '227 itself to Slingshot, and Google Patents still lists Funai as current assignee of this number — a gap that should be closed by pulling the actual recordation and its correspondent field before anyone relies on this verdict for this number.

Verify at:

• https://assignment.uspto.gov/patent/index.html (search 7344227 and also 7195341; pull the correspondent field for reel 036577/0400 and for any Funai→Slingshot recording)
• https://assignmentcenter.uspto.gov/
• Google Patents legal events: https://patents.google.com/patent/US7344227/en

Two things to do next, in priority order. (1) Retrieve the correspondent of record on reel 036577/0400 — I could not, and it is the highest-value missing field. (2) Confirm by reel/frame whether the '227 was in the Funai→Slingshot tranche or was omitted; the title collision with US 7,195,341 makes the portfolio listings ambiguous on this exact point.

I'll research the prior-art citations for US 7,344,227, focusing on the references most likely to bear on claim 1's combination of features.

Let me fill in details on several more key references.

Prior-Art Analysis — US 7,344,227 B2

Analyst note on method and limitations. I was unable to run a live query inside USPTO PatentCenter/PatFT/Patent Public Search within this session; the bibliographic and citation data below comes from the Google Patents rendition of the official USPTO record for this specific number (US 7,344,227 B2, app. 11/676,551 — verified against the authoritative full text supplied to me), plus PTAB document URLs that surfaced during searching. I did not substitute results for any other number (e.g., US 6,734,927, US 7,344,225, etc.). Where I am not certain of a reference's internal disclosure, I say so rather than inventing it.

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1. The claim I am testing against (the only independent claim)

Claim 1 (method) requires, in combination:

§102 standard. Anticipation requires a single prior-art reference disclosing every element arranged as claimed. A reference that shows only the "buss-over-active-area" idea, or only polysilicon interconnections, is §103 art, not §102 art.

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2. Bottom line up front

No reference cited on the face of US 7,344,227 appears to anticipate claim 1 under §102. The claimed combination — (i) power buss over the power-transistor area and ground buss over the logic-circuit area, (ii) both busses in the second metal layer, and (iii) logic↔driver interconnection moved to polysilicon so that only two metal layers are needed — is not met by any single cited document that I can verify. The cited art divides into:

• Group A (closest on "buss over underlying transistor area"): US 6,309,053 B1; US 6,726,311 B2 — §103 art; each lacks the logic-area ground-buss overlap and the polysilicon interconnect.
• Group B (closest on architecture / layer count / power distribution): US 6,787,050 B2; US 2003/0011658 A1; US 5,835,112 A; US 6,554,404 B2; US 5,146,341 A — §103 art.
• Group C (polysilicon / multi-level interconnection): US 5,146,341 A; US 2003/0210301 A1; US 4,887,098 A — §103 art; none routes the second-metal buss over the logic area.
• Group D (background/general printhead structure): the remaining ~28 citations.

Additionally, searching surfaced a PTAB/IPR record that appears to involve the parent '341 patent (see §5) — which contradicts the "no IPR/PTAB found" conclusion in the earlier section of this analysis and introduces additional prior art (Torgerson; Bruce; Parish; "Giere178"; Yabe) that is arguably more on-point than any of the 39 examiner citations.

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3. Tier-1 analysis: the references most probative against claim 1

3.1 US 6,309,053 B1 — Hewlett-Packard (the single closest examiner citation)

• Full citation: US 6,309,053 B1, "Ink jet printhead having a ground bus that overlaps transistor active regions," Hewlett-Packard Co. (family EP 1303412 A1/B1; WO 2002/007979 A1).
• Filing / priority: 2000-07-24 (app. 09/621,922). Issued: 2001-10-30.
• Description (verified from the record): A slot-fed thermal ink-jet printhead with a columnar array of ink drop generators, a columnar array of FET drive circuits, and power traces including a ground bus that "generally extends along a longitudinal extent of said columnar array of FET circuits, and partially overlying said active regions" (claim 1). The ground bus is shaped (width varies with distance from the bond pads) to equalize/ minimize ground resistance. The record expressly notes the ground bus may extend around decoder logic circuits 35 to enlarge the ground bus without increasing substrate size or adding a conductor layer.
• Claim(s) it can reach: Not anticipated. It discloses 1[A]-ish, 1[B], 1[C] (columnar FET array, first-metal interconnection to heaters — FET source/drain electrodes are "formed of a same metallization layer as said ground bus," claim 5), and the power-transistor-area overlap concept for the ground bus (whereas claim 1[E] requires ground bus over the logic area and power buss over the transistor area). It does not show a second metal layer carrying both busses, nor polysilicon logic↔transistor interconnection. Best characterized as §103 art directed to a different bus/geometry allocation.

3.2 US 5,146,341 A — Xerox (multi-level interconnection + polysilicon option)

• Full citation: US 5,144,341 A, "Thermal ink jet drivers device design/layout," Xerox Corp.
• Filed: 1992-04-26? — record shows Priority 1991-04-26; Issued 1992-09-01 (app. 07/692,087). (Note: the Google Patents record shows filing Apr 26 1991; treat the 1991 filing date as authoritative.)
• Description (verified): Printhead with multiple levels of interconnection and ballast resistors. Claims recite first and second power busses interconnected by leads "formed beneath or above said common return," with the low-resistance connection optionally being "heavily doped polysilicon on a field oxide" (claim 3) or n+ diffusion/silicide (claims 2, 4-6).
• Claim(s) it can reach: Not anticipated. It is relevant to 1[D] (a polysilicon conductor used as a low-resistance/interconnect structure in a printhead) and to the general notion of routing a conductor over another. But the reference is a bus/ballast balancing disclosure; it does not teach a polysilicon logic↔power-transistor interconnect, nor a second-metal buss overlapping a logic circuit area. §103 art at best.

3.3 US 6,787,050 B2 / US 2003/0011658 A1 — Lexmark (Parish) — power distribution, layer-count reduction

• Full citation: US 6,787,050 B2 (and its publication US 2003/0011658 A1), "Power distribution architecture for inkjet heater chip," Lexmark International, Inc. (Parish et al.), filed 2001-04-12 (app. 10/242,993 for the patent); issued 2004-09-07.
• Description (verified): A heater chip in which a single layer of metallization provides the interconnecting circuitry, enabled by placing ink vias between the transistor devices and the power side to free surface area. Also discloses temperature-sense resistors (TSRs) and, per the IPR record, TSR structures "can include an N-type source drain (NSD) material, a N-well layer material, a P-type source drain (PSD) material, a lightly doped drain (LDD) material…" — i.e., non-metal TSR material.
• Claim(s) it can reach: Not anticipated. Strong §103 art for dependent claim 4 (TSR array) and claim 5 (non-metal TSR), and generally for the "reduce layer count / free up area" motivation that underlies claim 1. It does not disclose buss-over-logic-area routing or polysilicon logic↔driver interconnects, and its stated goal is one metal layer, not the claimed two.

3.4 US 6,726,311 B2 — Hewlett-Packard ("Energy balanced printhead design")

• Full citation: US 6,726,311 B2, "Energy balanced printhead design," Hewlett-Packard Development Co., L.P. Filed 2001-01-30; issued 2004-04-27.
• Description (verified, from examiner listing): "A narrow ink jet printhead having efficient FET drive circuits configured to compensate for parasitic resistances of power traces… further includes ground buses that overlap active regions of the FET drive circuits."
• Claim(s) it can reach: Not anticipated — same gap as US 6,309,053 (it overlaps the transistor active region, not the logic area; no polysilicon interconnect; busses not both in a second metal layer). §103 art. This reference is arguably as close as US 6,309,053 on the "buss-over-active-region" idea and belongs in the same tier.

3.5 US 5,835,112 A — Hewlett-Packard ("Segmented electrical distribution plane")

• Full citation: US 5,835,112 A, "Segmented electrical distribution plane," Hewlett-Packard Co. Filed 1996-10-08; issued 1998-11-10.
• Description (verified): A segmented electrical distribution structure with a uniform high-resistance layer and a low-resistance (gold) layer patterned to define conductors between a main contact point and use points; conductor width is chosen to balance resistance among resistors. Uses two conductive layers (high- and low-resistance) — but not two metal conductor layers as claimed.
• Claim(s) it can reach: Not anticipated. Relevant to 1[E]'s premise (sizing conductors for resistance) and to layer-selection generally. §103 art only.

3.6 US 5,146,341's sibling and the polysilicon family — US 2003/0210301 A1 (Xerox) and US 4,887,098 A (Xerox)

• US 2003/0210301 A1, "Polysilicon feed-through fluid drop ejector," Xerox Corp. Filed 2002-05-08; published 2003-11-13.
• US 4,887,098 A, "Thermal ink jet printer having printhead transducers with multilevel interconnections," Xerox Corp. Filed 1988-11-25; issued 1989-12-12.
• Description: Both are directed to using a polysilicon layer as an electrical feed-through/interconnect in a thermal printhead (the '098 patent is an early multi-level-interconnection printhead).
• Claim(s) they can reach: Not anticipated. Directly relevant only to 1[D]'s "polysilicon conductor layer" concept. §103 art.

3.7 US 6,554,404 B2 — Hewlett-Packard (Giere et al., "Conductor routing for a printhead")

• Full citation: US 6,554,404 B2 (pub. US 2002/0101479 A1), "Conductor routing for a printhead," Hewlett-Packard (Giere, White, Weber). Filed 2001-10-31 (app. 10/000,110); issued 2003-04-29.
• Description (verified): Conductor routing in a thin-film membrane over a substrate opening; "the TEOS and field oxide layers also insulate polysilicon gates of transistors… used to couple energization signals to the resistors." Ground lines (gold) are formed above the AlCu traces.
• Claim(s) it can reach: Not anticipated. Touches 1[C]/1[D] background (polysilicon gate insulation; a metal layer above another). Notably, the PTAB record I surfaced refers to a "Bruce" reference disclosing "a fluid ejection device [that] comprises a first metal layer and a second…" and to "Giere178" — Giere-family art — as IPR grounds (see §5). §103 art.

3.8 US 6,543,883 B1 and US 6,422,676 B1 — Hewlett-Packard (drive circuitry placement / compact printhead)

• US 6,543,883 B1, "Fluid ejection device with drive circuitry proximate to heating element," HP. Filed 2001-09-29; issued 2003-04-08. (Title-based description: places drive circuitry close to the heater element — relevant to 1[B]/1[C] adjacency.)
• US 6,422,676 B1, "Compact ink jet printhead," HP. Filed 2001-06-19; issued 2002-07-23. (Title-based description: compactness/substrate-size reduction.)
• Claim(s) they can reach: Not anticipated. §103 motivation-to-combine art for the substrate-size-reduction objective.

3.9 US 6,575,562 B1 — Lexmark ("Performance inkjet printhead chip layouts and assemblies")

• Full citation: US 6,575,562 B1, Lexmark International, Inc. Filed 1999-11-16; issued 2003-06-10.
• Claim(s) it can reach: Not anticipated. Layout/assembly art from the same assignee; §103 background.

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4. Full citation inventory (all 39 entries on the face of the patent)

Dates are as listed on the Google Patents record (priority/filing date → publication/issue date). Descriptions are from the titles and, where verified, the reference text. "§102?" = does this single reference appear to anticipate any claim of the '227 patent?

Note a record oddity (flagged, not corrected): Google Patents shows the citation set as "35 documents" in one field and "Patent Citations (39)" in another; the table above reflects the fuller 39-item list.

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5. ⚠️ Contradiction with the earlier "Litigation" section — PTAB/IPR activity surfaced

The earlier section of this analysis stated: "the patent'sown prosecution record shows no reissue, reexam, or IPR entries" and "No … PTAB … in which the '227 patent is identified." My search this round surfaced PTAB petition documents on ptacts.uspto.gov (petitions 1550157 and 1550720) that quote the claim language of this family — specifically the limitation "a ground conductor for the ejection actuators routed in the second metal conductor layer disposed in overlapping relationship with at least a portion of the logic circuit area of the substrate," which is the apparatus-claim counterpart of '227 claim 1[E] and appears in the parent '341 patent. These documents discuss Torgerson, Bruce, Parish, "Giere178", Yabe, and an expert declaration by a Dr. Pond.

I must flag this as a contradiction rather than reconcile it silently, with these caveats:

• I could retrieve petition text, not petition metadata (patent number under review, petitioner, filing date, institution status). I therefore cannot confirm the '227 patent itself is in an IPR — the quoted limitation is shared with the parent '341, and the "Giere178/Yabe/'708 patent" subject matter in petition 1550720 concerns a different Lexmark family ("Methods and apparatuses for sensing temperature of multi-via heater chips").
• Treat "IPR exists on the '341 family" as a strong lead requiring verification, not an established fact.

Why this matters to the prior-art question: the adversarial art in those petitions may be more material than the examiner citations:

• Torgerson (HP) — as characterized in the petition record: a printhead with primitive-select power traces in a top (gold) metal layer overlying the FET drive circuits, and a ground bus in a lower first metal layer. This is the closest reading yet of claim 1's "power buss over the power-transistor area in the second metal layer." The petition argues Torgerson's ground bus extends "around decoder logic circuits 35," touching 1[E]'s logic-area language.
• Bruce (HP) — characterized as disclosing "a fluid ejection device compris[ing] a first metal layer and a second…" with a ground portion in a second metal layer — the §103 hook for moving the ground buss into the upper layer over the logic area.
• Parish (US 6,787,050 — already on the face of '227) — supplies the TSR / non-metal TSR teaching for dependent claims 4-5.
• "Giere178" / Yabe — appear in a different petition (the '708 patent), so I flag low confidence on their relevance here.

If a petition genuinely targets the '341/'227 claims, the institution decision and any final written decision would be the single most important prior-art artifact for this patent — verify at the USPTO Patent Trial and Appeal Board (PTAB) E2E / Patent Public Search "Proceedings" tab using the '341 and '227 numbers, and at CourtListener/PACER.

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6. What each dependent claim is exposed to (candid §102/§103 view)

Because no single reference meets all of claim 1, strictly no dependent claim is anticipated under §102 either. Provisionally, if claim 1 were held anticipated by some reference R, then R would also need to show:

The strongest §103 combinations an examiner/petitioner would likely assemble are: US 6,309,053 or US 6,726,311 (buss over active region) + US 5,144,341 or US 2003/0210301 (polysilicon interconnect) + Parisha (TSR/non-metal TSR), with Bruce/Torgerson supplying the "second-metal-layer ground over logic area" teaching.

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7. Explicit uncertainty flags

1. No §102 anticipation found — this is a negative finding over the 39 examiner citations; it is not proof that no anticipating reference exists (e.g., I have not verified the full text of every foreign-language or non-US entry).
2. PTAB/IPR contradiction — the earlier section said no IPR; petition documents surfaced this round. The petition article numbers (1550157, 1550720) and the party names (Pond, Bruce, Torgerson, Giere178, Yabe) are reported as found; I could not confirm the patent number, petitioner, or institution status, so I do not assert an IPR is pending on '227 specifically.
3. Inventor-name and citation-count discrepancies already flagged in prior sections remain (David G. King vs. "David Golman King"; 35 vs. 39 citation entries).
4. Descriptions of several Group-D references (e.g., US 6,543,883, US 6,422,676, US 6,575,562) are title-based where I could not pull the reference text in this session; they are marked accordingly and should not be relied on for element-by-element mapping.

Recommended next steps for a definitive §102/§103 opinion: (a) pull each reference's full text in Patent Public Search / Espacenet, (b) pull the PTAB petition + institution decision for the '341/'227 family via the PTAB E2E portal, and (c) run the claim chart against Torgerson and Bruce, which the petition record indicates are the real prior-art focal points — not the examiner citations alone.

I'll ground the key cited references before building the § 103 analysis.

A key lead surfaced: an actual IPR (IPR2022‑01414) against the parent '341 patent using Torgerson (US 6,309,053) + "Bruce." Let me identify those and the outcome.

Obviousness Analysis — US 7,344,227 B2 under 35 U.S.C. § 103

Scope note. As instructed, I build this analysis primarily from the Prior Art section of the US 7,344,227 record (the 35–39 cited references) and from the claim set already catalogued in the earlier sections. I treat the Google Patents full text as authoritative for the patent, and I treat the search results surfaced during this task as the current ground truth for the prior art and proceeding facts — one of which materially changes the picture drawn in the earlier "Patent summary" and "Litigation" sections (see §7, Contradictions and corrections).

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1. Legal framework and burden

• Obviousness is a question of law based on the Graham v. John Deere factors: scope/content of the prior art, differences between the claims and the prior art, PHOSITA level, and objective indicia.
• Under KSR Int'l Co. v. Teleflex Inc., 550 U.S. 398 (2007), a combination is obvious where the improvement is a predictable use of prior-art elements according to known methods yielding no more than expected results, where there is a design need or market pressure, and where the art presents "a finite number of identified, predictable solutions." KSR at 417, 420–21. A claimed layout/routing change is classically within this space.
• Critically, the patent's own background admits the design need: it concedes a "competing need to maintain or reduce the size of the substrates so as to minimize the cost," and that shrinking the busses raises resistance and heat. That admission supplies a motivation for the claimed routing independent of the prior art.
• The claim is a method of making/layout claim (step 1–5 in the earlier summary). Each step is a conventional thin-film fabrication act (provide a slot; form arrays; form logic; deposit a second metal layer). The only alleged contribution is the geometric routing result — and it is precisely that geometry the cited art addresses.

Threshold conclusion (high confidence): no single cited reference anticipates claim 1. The closest face-cited reference, US 6,309,053 B1, claims a ground bus overlying FET active regions, not a ground conductor over the logic circuit area, and it does not clearly teach a polysilicon logic-to-power-transistor interconnect. So the proper vehicle is §103, not §102.

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2. The dispositive external evidence — the parent patent has already fallen

The most probative evidence for obviousness of '227 is not hypothetical. The parent of '227 — US 7,195,341 (Ser. No. 10/956,939), the same specification and priority — was adjudicated in IPR2022-01414 (Canon U.S.A., Inc. et al. v. Slingshot Printing LLC), and the Federal Circuit affirmed on April 23, 2026 (Slingshot Printing LLC v. Canon, No. 24-1956, nonprecedential).

• The Board held claims 1–5 and 8 of the '341 patent unpatentable as obvious over U.S. Patent No. 6,412,917 ("Torgerson") and U.S. Patent No. 7,240,997 ("Bruce").
• '341 claim 1 recites, essentially verbatim in apparatus form, the same five elements as '227 claim 1: columnar array of actuators; columnar array of power transistors connected through a first metal layer; columnar array of logic circuits connected through a polysilicon layer; power conductor in a second metal layer overlapping the power-transistor active area; and ground conductor in the second metal layer overlapping the logic circuit area.
• The Board found Torgerson does not teach the ground conductor in the second metal layer over the logic area, but that a skilled artisan would have been motivated to implement Bruce's second-metal-layer ground conductor in Torgerson; the court affirmed.

Why this drives '227. '227 is a division of the identical application and shares the identical disclosure. If '341 claim 1 — the apparatus mirror of the '227 method claim — is obvious, then '227 claim 1, reciting the making of that same structure, is obvious for the same reasons: the method steps add only conventional fabrication acts to an admittedly obvious structure. This is the strongest possible non-hypothetical showing.

Caveat (must be stated plainly): IPR2022-01414 addressed '341, not '227. I found no IPR naming '227 itself. The '227 claims are therefore not formally cancelled, and a separate petition against '227 would still have to be filed and won. My point is probative weight, not res judicata.

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3. Ground 1 (primary): face-cited HP/Torgerson art + second-metal-ground art + polysilicon-interconnect art

Because the task directs me to the face-cited prior art of '227, I map the same combination using references that actually appear on the '227 record, plus the adjudicated references as corroboration.

3.1 References relied on

3.2 Element-by-element mapping of '227 claim 1

This is, in substance, the same combination the Board and the Federal Circuit sustained against the parent claim — with the face-cited HP references (6,309,053 / 6,422,676 / 6,543,883) standing in for Torgerson.

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4. Ground 2 (alternative): the HP overlap art + Xerox polysilicon feed-through + Lexmark power-distribution art

For an examiner or litigant confined strictly to the four corners of the '227 citation list:

1. US 6,309,053 B1 — the base reference. Its claim 1 already recites the substrate, a columnar array of drop generators, a columnar array of FET circuits "adjacent said ink drop generators," and a ground bus generally extending along the array and partially overlying said active regions — i.e., elements 1(a)–(c) plus the overlap concept for the ground bus.
2. US 6,543,883 B1 — teaches columnar drop generators with FET drive circuitry proximate to the heating element and an associated ground bus, providing the "adjacent arrays" architecture.
3. US 2003/0210301 A1 (Xerox) — supplies the express teaching of using a doped polysilicon layer as a conductor/feed-through in a fluid drop ejector, the missing "polysilicon logic-to-transistor interconnect" element.
4. US 2003/0011658 A1 / US 6,787,050 B2 (Parish, Lexmark) — supplies the express teaching that a heater chip's address lines may be a composite of metal and a polysilicon conductive layer separated by dielectric, confirming that routing some interconnections in polysilicon while reserving metal layers for power/ground was known.
5. US 5,835,112 A (HP, "Segmented electrical distribution plane") and US 6,554,404 B2 (HP, "Conductor routing for a printhead") — supply power/ground bus routing and segmentation in a printhead substrate.
6. One of the face-cited references with a second-metal ground teaching (the "Bruce-type" concept) is still needed to land the ground-over-logic limitation; absent it, this ground is weaker on that single limitation. If the panel insists on face-only art, US 6,554,404 and US 6,726,311 ("Energy balanced printhead design") are the most likely places to find second-metal ground area over logic, and should be read in full before relying.

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5. Motivation to combine (the KSR rationales)

A POSITA would combine these references for several independent, mutually reinforcing reasons:

1. Design need / market pressure. The '227 specification itself states the competing need to reduce substrate size to minimize cost. US 6,422,676 is expressly directed to a compact printhead and recites packing-density and die-width objectives. Where two references "seek to address an overlapping problem — reducing the substrate size," the Board and the Federal Circuit found motivation. (Directly applicable here.)
2. The prior-art teaching supplies the very benefit claimed. "Bruce" states that putting the ground in the second metal layer (i) reduces energy variation via decreased ground resistance, and (ii) "avoids costs associated with increased die sizes which result where ground resistance is decreased by widening ground paths in the first metal layer." That is the patent's own stated advantage — reduced size without increased bus resistance.
3. Finite number of predictable solutions. The Board characterized the ground-bus placement as "one of just two basic options" and therefore among "a finite number" of "predictable solutions" under KSR at 420. The same logic governs the power-bus placement over the transistor active area.
4. Known technique applied to a known structure. Routing a bus over underlying circuitry to reclaim area was known (US 6,309,053); using polysilicon for short/local interconnects in a heater chip was known (US 2003/0011658; US 2003/0210301). The combination is the predictable application of two known techniques.
5. No teaching away. The patent's own concession that polysilicon is higher-resistance does not teach away; the patent itself resolves that by using polysilicon only where timing is non-critical — an optimization a POSITA would arrive at as a matter of ordinary skill. "The fact that the motivating benefit comes at the expense of another benefit … should not nullify its use as a basis to modify." Winner Int'l Royalty Corp. v. Wang, 202 F.3d 1340, 1349 n.8 (Fed. Cir. 2000); In re Fulton, 391 F.3d 1195, 1200 (Fed. Cir. 2004) (combination need not be the preferred or most desirable one).

Rebuttals already tested and rejected in the parent IPR. Slingshot argued that (a) moving Torgerson's ground to the second layer would increase substrate width, (b) it would negate Torgerson's compactness, and (c) Bruce's approach was not an "improvement in a categorical sense." The Board and the Federal Circuit rejected all three, relying on Winner International, Intel v. PACT XPP, and In re Fulton. The same arguments would fail against '227.

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6. Dependent claims (2–9)

Note an important claim-set divergence: the '341 IPR adjudicated '341 claims 1–5 and 8 (device claims: heater resistors = cl. 2; ≥3 slots = cl. 3; FETs = cl. 4; logic-circuit group = cl. 5). '227's method claims 4–7 (the temperature-sense-resistor (TSR) claims) have no counterpart in the adjudicated set and were not tested. That is the only place where '227 adds anything beyond the parent claim set.

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7. Contradictions and corrections to the previously generated sections

The earlier sections were generated before the IPR/CAFC evidence surfaced. I flag the following explicit contradictions and do not silently resolve them:

1. "No CAFC 2026 docket activity for patent 7,344,227 was found." — Still true for '227 itself, but incomplete for the family. CAFC No. 24-1956, Slingshot Printing LLC v. Canon, opinion issued April 23, 2026 (nonprecedential), affirms the PTAB's obviousness holding against US 7,195,341 — the parent of '227. The prior search missed this because it queried "7344227"; the docket is captioned to the '341 patent.
2. "No reissue, reexam, or IPR entries" / "no litigation" for the family. — Corrected: the family was subject to IPR2022-01414 (filed Aug. 23, 2022; institution Apr. 13, 2023; FWD terminating Apr. 9, 2024), Canon U.S.A., Inc. et al. v. Slingshot Printing LLC. This explains the Google Patents "Family has litigation" Darts-IP flag (family 36098540) that the earlier section could not resolve.
3. Current assignee = Funai Electric Co., Ltd. — The Google Patents "Current Assignee" field shows Funai (last recorded assignment, 2015-09-16). However, the Patent Owner of record in IPR2022-01414 is Slingshot Printing LLC. These are apparently inconsistent records; per the operating rules I report both rather than auto-correcting. I do not assert that the USPTO assignment record was updated to Slingshot.
4. Inventor name discrepancy ("David G. King" vs. "David Golman King") — unchanged; still unresolved.
5. Reference-identity flag. The IPR was decided on US 6,412,917 ("Torgerson") and US 7,240,997 ("Bruce"). Neither of those two numbers appears on the '227 citation list. The '227 record instead cites US 6,309,053 B1 and US 6,422,676 B1 (HP), which teach the same ground-bus-over-active-region subject matter. I have not verified whether 6,412,917 is a continuation of 6,309,053, and I do not assert a family relationship between them. The combination is strongest if the '227 record's 6,309,053/6,422,676 are treated as the stand-in for Torgerson, with Bruce-type second-metal-ground art added.

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8. Secondary considerations / objective indicia

None is apparent on the record reviewed. No unexpected result is claimed: the patent asserts only the expected consequence of routing wider busses over existing circuitry (lower resistance, less heat, smaller die). Where the claimed effect is the predictable result of the known technique, objective indicia do not overcome the KSR case. (Also note the patent is Expired – Lifetime, anticipated expiration 2024-09-30, which limits any commercial-success narrative tied to current sales.)

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9. Bottom line and confidence

Claim 1 is very likely obvious over (i) the HP/Torgerson-family overlap art cited on the '227 face (US 6,309,053, 6,422,676, 6,543,883), in view of (ii) a second-metal ground-over-logic teaching of the Bruce type, and (iii) a polysilicon local-interconnect teaching (Torgerson itself, and expressly US 2003/0210301 and US 2003/0011658). Claims 2, 3, 6–9 are obvious on the same or simpler grounds. Claims 4–5 (TSR array and non-metal TSR material) are the residual vulnerability — they are method-only additions with no adjudicated counterpart, and I could not pin an express face-cited disclosure of a columnar TSR array between the drivers and the ejectors; those two claims warrant a dedicated search before any conclusion is treated as final.

Confidence: High for claim 1 and claims 2–3 and 6–9, given the Federal Circuit's April 23, 2026 affirmance on materially identical subject matter. Medium for claims 4–5, due to the identified evidentiary gap. I have verified the claim text of US 6,309,053, the abstract/claim text of US 2003/0011658/US 6,787,050 and US 2003/0210301, and the IPR/CAFC holdings; I have not read every one of the 35–39 cited references in full, and I recommend full-text review of US 6,422,676, US 6,543,883, US 5,835,112, US 6,554,404, and US 6,726,311 before the analysis is finalized.