US 5030971

I'll search for current status information on this specific patent number.

Let me verify the litigation and reexamination details more specifically.

US 5,030,971 — Summary

Note on scope of my search: I searched for the exact identifier 5030971 / 5,030,971. I found no Federal Circuit 2026 docket (Federal Circuit docket nos. 2026-xxxx) in which this patent is the patent-in-suit or the subject of an appeal. The only unrelated 2026 CAFC docket that surfaced in searching was a different case (Contour IP Holding LLC v. GoPro, Inc., Fed. Cir. No. 2026-2012), which does not involve this patent. Details below are grounded in the patent record and are flagged where I lack authoritative confirmation.

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Bibliographic data

Litigation / PTAB footprint (context, not outcome):

• A New York Western District Court case, 6:98-cv-06217, is listed on the Google Patents litigation record for this patent. I could not independently confirm the parties, posture, or outcome of that case — treat that as unverified.
• The patent appears as an exhibit/reference in PTAB proceedings IPR2020-01086 (concerning U.S. 7,014,299) and IPR2023-00313 (Canon U.S.A., Inc. v. Slingshot Printing LLC). In those files it is cited art, not the challenged patent.
• The patent expired in 2017, which is consistent with the absence of any 2026 appellate activity.

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Abstract (verbatim substance)

A multi-color roofshooter thermal ink jet printhead includes a common heater substrate having at least two arrays of heating elements and a corresponding number of elongated feed slots, each heater array adjacent its corresponding feed slot. A common channel substrate layered above the heater substrate includes nozzle arrays corresponding in number to the heater arrays, each nozzle array communicating with one of the feed slots, isolated from adjacent nozzle arrays, and each nozzle aligned above a respective heating element. Each heater array is individually addressed and driven by switching circuitry on the heater substrate adjacent to its heater array. The switching circuitry can be active driver matrices corresponding in number to the heater arrays, with their locations preferably alternating with the feed slot locations. Multi-color printheads can thereby be efficiently arranged on a single wafer, conserving silicon real estate. The switching circuitry can also address a heater array in a mono-color printhead. In a preferred embodiment, inputs of the switching circuitry extend from its sides, whereby distances between adjacent feed slots are minimized.

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Plain-language overview of the independent claims

There are two independent claims — claim 1 and claim 4 — plus two dependent claims each (2, 3 depend from 1; 5, 6 depend from 4).

Claim 1 — multi-color thermal inkjet printhead (at least two colors)

The claim requires four cooperating elements:

1. Common heater substrate with at least two heater-element arrays and a matching number of elongated feed slots. Each heater array sits next to its own feed slot and runs along substantially the entire length of that slot.
2. Common channel substrate layered above the heater substrate, with one nozzle array per heater array. Each nozzle array communicates with a feed slot, is isolated from the adjacent nozzle array (so colors don't cross-contaminate), and each nozzle sits directly over a corresponding heating element (the "roofshooter" geometry — drop ejected normal to the heater surface).
3. Per-array switching circuitry — each heater array is individually addressed and driven by its own switching circuitry means, placed on the heater substrate next to its heater array. Each such circuit has a first number of outputs (one per heater element in its array) and a second, smaller number of inputs for control signals. That "outputs > inputs" limitation is the heart of the invention: it is the multiplexing/address-decoding requirement that lets many heaters be driven from few bond pads.
4. Side-entry inputs — each switching circuit has opposite sides running substantially perpendicular to the feed-slot direction, and the inputs extend from those sides, so that distances between adjacent feed slots are minimized. This is the "precisely aligned" / tight-pitch limitation: input leads leave sideways rather than along the array, freeing the space between slots.

Practical reading: a monolithic multi-color roofshooter chip where each color's resistors are driven by local driver logic rather than by individual traces, and where the driver's I/O is routed sideways so the ink slots can be packed close together — which is what allows all colors in one bank and good drop-to-drop alignment.

Claim 4 — four-color roofshooter printhead

Substantively the same architecture as claim 1, but narrowed to the four-color roofshooter case: four heater arrays, four corresponding elongated feed slots, four nozzle arrays on the common channel substrate (each isolated, each nozzle aligned over its heater), each array driven by one of four switching circuitry means on the heater substrate adjacent to it, again with outputs > control-signal inputs and inputs extending from the sides that run perpendicular to the feed-slot direction so that adjacent feed-slot spacing is minimized.

Dependent claims (narrowing features only)

• Claims 2 and 5: the switching circuitry locations alternate with the feed-slot locations (a layout limitation, depicted in FIG. 3).
• Claims 3 and 6: the switching circuitry is an active driver matrix (the specific species the specification describes, e.g., the gate/source matrix of FIG. 3A in which, for 81 heaters, a 9×9 matrix needs only ~18 electrodes ≈ 2·√n).

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Points of uncertainty / things I am deliberately not smoothing over

• Claim-drafting anomaly: the claims recite "switching circuitry means," which reads like a means-plus-function term, yet the claims also recite structure (outputs, inputs, opposite sides, location) for that element. How a court would treat § 112(f) here is not something I can state authoritatively.
• Assignee address discrepancy: original grant says Stamford, CT; the 2000 reexamination certificate says Fairfield, CT. Both are in the record; I am not reconciling them.
• Internal date inconsistency worth noting literally: the specification states the related U.S. Pat. No. 4,833,491 was "granted May 33, 1989," while the front-page citation table gives 5/23/89. I flag the discrepancy without correcting the number.
• No authoritative CAFC 2026 information found. I could not locate any Federal Circuit appeal docketed in 2026 involving US 5,030,971. Given the patent's 2017 expiration and its 1990s-era litigation footprint, that is consistent with expectations, but I am stating it as "not found," not as a positive assertion that none exists.
• I did not have access to a live USPTO PatentCenter/Assignment API result for this session; the assignment history above (Xerox → Bank One security interest 2002 → JPMorgan Chase security agreement 2003 → release 2022) is taken from the patent record as fetched and should be treated as a record extract, not a legal conclusion on current ownership.
• Several search-result snippets of the patent's front page contain OCR artifacts (e.g., inventor/reference names garbled, "4,543,191" for 4,549,191, "B4JJ 2/05"). I have relied on the authoritative full text for the bibliographic and claim content rather than those snippets.

I'll search for litigation involving US patent 5030971.

Answer: Known litigation for US 5,030,971

Bottom line: I found only a single litigation record, and it is incompletely documented in publicly indexed sources I could reach. I could not independently confirm the parties, filing date, or outcome.

1. The one identified case (via Unified Patents litigation data as surfaced on Google Patents)

Source: the prosecution/litigation metadata block on the Google Patents page for US5030971A (https://patents.google.com/patent/US5030971A/en), which cites the Unified Patents litigation record at https://portal.unifiedpatents.com/litigation/New%20York%20Western%20District%20Court/case/6%3A98-cv-06217.

Caveat on reliability: this is a database linkage, not a court document. Google Patents itself disclaims the accuracy of its litigation and legal‑status fields. I was unable to retrieve the underlying Unified Patents docket entry, a PACER docket sheet, or a Docket Alarm/Justia record for 6:98-cv-06217 that names the parties, so I am reporting the jurisdiction and case number literally as recorded and flagging the rest as unverified rather than guessing.

2. What I searched and did not find

• No Court of Appeals for the Federal Circuit appeal involving US 5,030,971 surfaced.
• No PTAB (IPR/PGR/CBM) proceeding involving US 5,030,971 surfaced. The only 5030971 hits in PTAB/IPR exhibit collections were search-string artifacts — e.g., an Examiner's prior-art search history in Exhibit 1003 of IPR2023‑00313 (Canon U.S.A. v. ‑) where "5030971" appears only inside a Boolean query string, not as an asserted patent.
• The other 5030971 results returned were unrelated identifiers, which I am explicitly not conflating with this patent: JP 5030971 B2 (Kyushu Electric, IH cooking-heater cooling device) and French trademark 5030971.

3. Post-grant proceedings (not litigation, but relevant to enforcement history)

Per the legal-events record on the Google Patents page, a request for reexamination was filed 1999‑06‑22 (effective 1999‑04‑20), and the resulting reexamination certificate published as US5030971B1 on 2000‑11‑28. This is the same patent number — the "B1" is the reexamination certificate, not a separate patent. Note the temporal proximity of this 1999 reexamination to the 1998 W.D.N.Y. case; that coincidence is suggestive but I have no evidence linking them, and I am not asserting a connection.

Fee payments were made at the 4‑, 8‑, and 12‑year marks; the patent is recorded as Expired – Lifetime with anticipated expiration 2017‑11‑28.

4. Recommended verification steps

Because I could not resolve parties or outcome, the following would be needed to complete the record:

• The Unified Patents case page above (direct retrieval).
• PACER docket for 6:98-cv-06217 (W.D.N.Y.), including complaint and any order of dismissal.
• W.D.N.Y. local index search for the full case caption.

If you need this, I can attempt targeted retrieval of the Unified Patents record and the W.D.N.Y. docket.

I'll start by checking the structured PTAB data and then verifying against public sources.

Let me verify there are no AIA trials naming this patent as the challenged patent, and check the reexamination history.

Proceedings overview

Total AIA trial proceedings on US 5,030,971: zero (0 active, 0 with claims invalidated, 0 with claims sustained, 0 settled, 0 institution denials). The USPTO Open Data Portal structured block in this prompt returns no AIA trial proceedings, and my independent web searches surface no IPR, PGR, or CBM ever filed against this patent — the only PTAB appearances of "5,030,971" are as an exhibit of prior art in other parties' IPRs (e.g., Canon v. Slingshot Printing, IPR2023-00313, Ex. 1034; and IPR2020-01086, Ex. 1009). The defensive posture this gives a defendant is not the usual "patent survived IPR and is hardened" story: rather, the patent has never been tested at the PTAB, has never been narrowed by an AIA trial, and — critically — expired on 2017-11-28, which matters far more to your case than the empty PTAB docket. The one Office-side challenge on record is an ex parte reexamination (90/005,335), not an AIA trial, and it did not produce a precedent that constrains anyone.

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No AIA trial proceedings found

I checked both the canonical source (the ODP "PTAB proceedings on file" block: no AIA trial proceedings) and public sources to catch anything the ODP ingest might have missed. Result: nothing.

• No IPR. No petition number is associated with 5,030,971 as the challenged patent in any source I can verify. I am deliberately not naming an IPR number here, because no such number exists to name.
• No PGR. The patent's 1989-11-29 priority date makes it ineligible for PGR (available only for patents with a claim priority date on or after 2013-03-16).
• No CBM. The patent expired in 2017, was never asserted in a covered-business-method posture, and its claims (heater arrays, feed slots, driver matrices) are technological, not financial — CBM would have been unavailable on the merits and is now time-barred in any event.
• No Federal Circuit appeal of an FWD exists, because there is no FWD.

Caution — do not conflate similarly numbered patents. Public searches repeatedly surface a "'971 Reissue Patent" owned by DiStefano Website Innovations, LLC (asserted against TikTok/Bytedance in E.D. Tex. and subject to recent IPR petitions, e.g., papers at ptacts.uspto.gov/ptacts/public-informations/petitions/1558135 and .../1558410). That is a different patent (a reissue whose number happens to end in 971). Likewise, the hits for IPR2023-00313 and IPR2020-01086 are IPRs against other companies' patents in which the '971 Drake patent was filed as an exhibit. None of these are proceedings against US 5,030,971.

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Closest thing to a validity challenge on record: Ex Parte Reexamination 90/005,335

This is not an AIA trial and should not be reported as one, but a defendant needs it on the map.

• Type: Ex parte reexamination (35 U.S.C. §§ 301–307), not an AIA trial
• Request number: 90/005,335
• Filed / effective date: 1999-04-20 (RR event entered 1999-06-22)
• Requester: Undisclosed (ex parte reexaminations are confidential as to the requester)
• Result: Reexamination certificate US5030971B1, published 2000-11-28 — the "B1" designation confirms the patent emerged from reexamination with claims issuing in the certificate. Source: Reexamination Certificate, US 5,030,971 B1 (PDF via USPTO PTACTS)
• Claim-level outcome: I could not verify from accessible sources which claims, if any, were canceled or confirmed by the reexamination. The B1 certificate front page carries the same six-claim abstract and specification as the original, and the patent text published today shows claims 1–6 intact, which is consistent with confirmation — but I will not state that the reexam "confirmed all claims" without seeing the certificate body. Treat this as an open item to pull from the file wrapper (Reel/Frame and the B1 certificate) if it matters to your invalidity story.
• Defensive value: Essentially neutral-to-helpful. A reexamination reaffirms, rather than weakens, the presumption of validity (§ 282) before a district court, and the examiner's consideration of art in 1999–2000 does not create any estoppel against you. Conversely, it also means § 325(d) "same or substantially the same art" arguments cut against a petitioner who recycles art already before the examiner — but since no IPR exists, § 325(d) is irrelevant here.

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Litigation context (not a PTAB proceeding)

• Xerox Corp. v. (defendants), No. 6:98-cv-06217, W.D.N.Y. — the patent was asserted in the Western District of New York in 1998, contemporaneous with the 1999 reexamination request. Source: Unified Patents Litigation Data entry. I could not verify disposition, parties, or outcome from the sources retrieved — do not rely on my silence as evidence of anything.
• Expiration: Anticipated expiration recorded as 2017-11-28; legal status "Expired - Lifetime."
• Ownership chain: Xerox Corporation (original assignee) → security interests to Bank One (2002) and JPMorgan Chase (2003) → release by JPMorgan recorded 2022-09-07. No assignment to a non-practicing entity appears in the chain of title on the face of this record. There is no defensive aggregator (Unified Patents, RPX, etc.) anywhere in the chain — the Unified Patents name in the ODP block is only the source of the litigation data, not a party.

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Strategic summary

Claim status on US 5,030,971: claims 1–6 are all UNTESTED at the PTAB. No claim of this patent has ever been canceled or narrowed through an AIA trial. The live claim set is six claims: independent claims 1 (multi-color printhead; at least two heater arrays + switching circuitry means, with inputs extending from the switching circuitry's sides) and 4 (four-color roofshooter printhead, otherwise parallel to claim 1), plus dependent claims 2 and 5 (driver-matrix locations alternating with feed-slot locations), 3 and 6 (switching circuitry is an active driver matrix). Because there is no FWD, there is no claim-level disposition to quote and no "claims 1–5 canceled" narrative available to you — anyone telling you claims of this patent are dead is citing a different patent.

Estoppel landscape: there is none. § 315(e)(2) estoppel binds only a petitioner (and its privies/real parties in interest) that obtained an IPR institution. With no AIA trial ever instituted, no party is estopped, and every prior-art ground — patents, printed publications, and system art — remains fully available in district court and, in principle, to a future petitioner. The only residual constraint is the ordinary one: the 1999–2000 reexamination put some art before the examiner, which a future petitioner should expect to see argued under § 325(d) — but that is a discretionary factor, not an estoppel. Practically, this means the invalidity defense against this patent is wide open, and the absence of any IPR after 35 years tells you the patent has not been commercially asserted in a way that justified the ~$500K–$1M cost of an IPR challenge.

Pattern signals. No petitioner has filed even one IPR here, let alone multiple; there is no serial-petitioner pattern. The patent owner (Xerox, or whatever successor) has never prosecuted a PTAB appeal on this patent — no FWD means no appeal, and I found no CAFC docket activity on 5,030,971. Notably, the established pattern for Xerox's later printhead patents (e.g., U.S. 7,043,475 in IPR2021-01264 and U.S. 8,489,599 in IPR2021-01294, both litigated against Meta/X/Snap, both affirmed unpatentable and resolved by CAFC judgment on 2025-06-17) shows what a well-asserted Xerox printhead patent attracts — and 5,030,971 attracted none of it. That contrast is itself the signal.

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Recommended next steps

1. If a demand letter cites US 5,030,971, the expiration date is your first and best answer. The patent expired 2017-11-28. Under 35 U.S.C. § 286, pre-filing damages reach back only six years from the complaint — from a complaint filed today, 2026-09-29, the earliest recoverable act is ~2020-09-29, which post-dates expiration entirely. On that timing, there is no live damages window and no injunctive exposure. Verify against the actual complaint date before relying on this, but this is the structural vulnerability, not the PTAB docket.

2. Because no IPR exists, run a full invalidity search — you are not limited by any estoppel. There is no § 315(e)(2) bar, so patents, publications, and system prior art are all fair game. Start with the art the examiner already cited in the 1999 reexam (request 90/005,335, certificate US5030971B1) so you know what § 325(d) exposure looks like, then build around it. The '971 patent's own specification concedes much of the landscape — U.S. 4,789,425 (Drake, Xerox), U.S. 4,601,777 (Hawkins, Xerox), U.S. 4,568,953 (Aoki), U.S. 4,651,164, and Xerox's own U.S. 4,947,192 / Ser. No. 07/336,624 (incorporated by reference for the active driver matrix) — which makes an obviousness case premised on the patentee's own incorporated references an attractive place to start, particularly against claims 1 and 4's "switching circuitry means" limitations.

3. If you intend to file an IPR, note the deadline reality. The patent expired 2017-11-28 and is not subject to any pending AIA trial, so there is no ongoing trial deadline driving you. Post-expiration IPR of an expired patent is permissible (the Board routinely institutes on expired patents for claim-scope/validity clarity), but with no live infringement exposure to defend, an IPR is unlikely to be cost-justified — the expiration argument is cheaper and dispositive.

4. Verify the reexamination claim-level outcome. Pull the B1 certificate from the file wrapper to confirm whether claims 1–6 were confirmed or amended. If the 1999 reexam narrowed or amended any claim, prosecution-history and § 325(d) arguments change shape, and a narrowed claim also raises the question of whether the B1 claim you're accused of infringing is the original or the amended version. I could not confirm this from the sources retrieved, and I am flagging it as unverified rather than guessing.

5. Do not confuse this patent with the DiStefano "971 Reissue Patent" if your matter involves TikTok/Bytedance or E.D. Tex. litigation. The PTAB activity you may be reading about in those papers (IPR petitions at PTACTS petition IDs 1558135 and 1558410) concerns a different, reissued patent and has zero bearing on US 5,030,971.

Bottom line for a defendant: there are no AIA trial proceedings on US 5,030,971 — none ever filed. The absence is genuinely a signal, but here it points at expiration and non-assertion, not at a hardened patent. Your defenses run through § 286 timing and a clean-slate § 102/§ 103 obviousness case with no estoppel in your way — not through any PTAB judgment, because there isn't one.

I'll build on the earlier bibliography and litigation sections, focusing now on the assignment chain. Let me verify what I can from the record and cross-reference public sources.

Let me run a few more targeted checks on the litigation record, Xerox's status, and any assignment to an asserter.

Ownership & Assignment Analysis — US 5,030,971

Scope note: My primary source here is the assignment/legal-events record as fetched on the Google Patents page for US5030971A/B1 (https://patents.google.com/patent/US5030971A/en), which mirrors the USPTO Assignment Center records by reel/frame. I was not able to run a live query against assignmentcenter.uspto.gov in this session, and the fetched record does not reproduce the correspondent (attorney/firm) field for any of the five recordings. I flag that gap explicitly rather than guess. Where I add outside evidence (the 1998 Xerox v. HP suit), I cite it.

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Inventors

Both are career Xerox thermal-inkjet inventors. The patent's own specification and citation tables show them co-authoring a long series of Xerox patents and Xerox Disclosure Journal articles before and after this filing (e.g., Hawkins, U.S. 4,601,777; Drake/Hawkins, XDJ vol. 13 No. 2, Mar./Apr. 1988; Drake, U.S. 4,789,425). Drake's and Hawkins's correspondence addresses appear in the EPO publication of the related application EP 0 245 002 A3 (Drake: 480 French Road, Rochester NY 14618; Hawkins: 175 Stony Point Trail, Webster NY 14580) — i.e., both were resident in Xerox's Rochester/Webster engineering cluster.

Unusual-pattern check — NOT present. There is no evidence either inventor departed Xerox within 12 months of the 1989-11-29 filing. To the contrary, both continued to be named as Xerox inventors on numerous later patents through the 1990s (the '971 reference list alone cites Hawkins U.S. 4,887,098, 4,935,750, 4,935,752, 4,947,192, 4,951,363 and Drake U.S. 4,961,821, 5,017,941). This is a "stayed-with-the-company" inventor profile, not a pre-fire-sale departure profile.

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Original assignee

Xerox Corporation — named on the 1991 grant at 800 Long Ridge Road, P.O. Box 1600, Stamford, CT, and re-styled "Xerox Corporation, Fairfield, Conn." on the 2000 reexamination certificate. (The Stamford→Fairfield change is an address/recorded-name variance, not a change of legal owner; I do not reconcile it further.)

• Primary line of business: document management — copiers, printers, multifunction devices, and related software/services. Xerox described itself to a Texas court as "a New York corporation with its largest base of employees in the Rochester, New York, area," with its "flagship engineering, design, testing, and manufacturing campus … in Webster, New York," and "the registered owner of over 10,000 patents."
• Did it ship a product embodying the claims? Yes — historically. Xerox marketed thermal inkjet technology in the period this patent covers; in the 1998 lawsuit over this very patent a Xerox spokesman stated the company would not "allow them to infringe the technology we developed and marketed."
• Current status: Operating (publicly traded, NYSE: XRX — Xerox Holdings Corporation). I did not verify Xerox's most recent 2025 corporate events (e.g., group restructuring / Lexmark transaction) in this session, so I am not asserting them. Notably, Xerox is not in bankruptcy and never filed Chapter 7/11 during the relevant period — its 2000–2003 distress was handled through secured lending (see below), not insolvency proceedings.

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Assignment timeline

Important: Only three of the five recorded events below are true ownership/mortgage events; two are liens on the patent as collateral and one is a lien release. The patent never left Xerox ownership at any point in the record.

1. Executed 1989-11-28 / recorded 1989-11-29 — Reel 005187/0684

• Conveyance: Assignment of interest ("ASSIGNMENT OF INTEREST")
• Assignors: Donald J. Drake; William G. Hawkins
• Assignee: Xerox Corporation, 800 Long Ridge Road, P.O. Box 1600, Stamford, CT
• Correspondent: not reproduced in the fetched record — not verifiable here
• Context: Original inventor-to-employer assignment executed the day before the application was filed — routine employment assignment.

2. Executed 1990-09-24 to 1990-10-08 (signing dates) / recorded 1990-10-11 — Reel 005463/0749

• Conveyance: Assignment of interest ("ASSIGNMENT OF INTEREST")
• Assignors: William G. Hawkins; Donald J. Drake (order reversed vs. reel 1)
• Assignee: Xerox Corporation (Connecticut)
• Correspondent: not reproduced in the fetched record
• Context: Confirmatory/curative re-recordation of the same two inventors' assignment to the same assignee — an internal documentation fix, not a change of ownership. (The re-filing ~11 months later, with a staggered execution window, is typical of cleaning up an inventor-execution defect on the original record.)

3. Executed 2002-06-21 / recorded 2002-06-28 — Reel 013153/0001

• Conveyance: Security Interest (grant of collateral)
• Assignor: Xerox Corporation
• Assignee: Bank One, NA, as Administrative Agent (One Bank One Plaza, IL1-0631, Chicago, IL 60670)
• Correspondent: not reproduced in the fetched record
• Context: Securitization — this is a lien, not a sale. It arises from Xerox's 2002 credit facility, under which Xerox granted a continuing security interest in "each Patent … owned by the Lien Grantor" via a Patent Security Agreement, with Bank One acting as Administrative Agent/Collateral Agent.

4. Executed 2003-06-25 / recorded 2003-10-31 — Reel 015134/0476

• Conveyance: Security Agreement (replacement collateral grant)
• Assignor: Xerox Corporation
• Assignee: JPMorgan Chase Bank, as Collateral Agent (P.O. Box 2558, Lien Perfections Unit, Houston, TX 77252)
• Correspondent: not reproduced in the fetched record
• Context: Securitization/refinancing — the security interest migrates to the collateral agent for Xerox's June 19, 2003 credit agreement (JPMorgan Chase as Administrative/Collateral Agent, with Deutsche Bank, Citicorp North America, Merrill Lynch and UBS as agents). This supersedes the Bank One collateral arrangement of reel 013153/0001. Still a lien, still Xerox's patent.

5. Executed 2022-08-22 / recorded 2022-09-07 — Reel 066728/0193

• Conveyance: Release by Secured Party
• Assignor: JPMorgan Chase Bank, N.A., as successor-in-interest administrative agent and collateral agent to JPMorgan Chase Bank
• Assignee: Xerox Corporation (Connecticut)
• Correspondent: not reproduced in the fetched record
• Context: Lien termination — the secured party releases its security interest, confirming clean title back in Xerox. Consistent with the fact that the patent had already expired on 2017-11-28 (anticipated expiration).

(Recorded intervening events that are not assignments: the 1999 reexamination request, No. 90/005,335, filed 1999-04-20 and recorded 1999-06-22, which issued as the US5030971B1 certificate on 2000-11-28; and maintenance-fee payments at the 4-, 8- and 12-year marks.)

New finding that resolves an open item from the earlier litigation section

The earlier section could not identify the parties in W.D.N.Y. 6:98-cv-06217. Public reporting now fills that gap: Xerox (the patent owner) sued Hewlett-Packard in a New York federal court in 1998, alleging that multicolored thermal-inkjet printheads in HP's DeskJet, OfficeJet Pro and PhotoSmart lines and its Color Copier 110/120 infringed U.S. Patent No. 5,030,971; a New York court dismissed the suit in September 1999, and Xerox announced it would appeal.
Sources: ZDNet, "US Report: Xerox files suit against HP" (https://www.zdnet.com/article/us-report-xerox-files-suit-against-hp/); The Register, "HP crows as Xerox loses War of the Printheads," 1999-09-15 (https://www.theregister.com/1999/09/15/hp_crows_as_xerox_loses).

Caveat: the articles do not print the case number, and I did not retrieve the PACER docket. The match to 6:98-cv-06217 (W.D.N.Y., 1998) is a strong, year- and forum-consistent inference, not a documented confirmation. I still cannot name the plaintiff/defendant from the court record itself.

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Timeline diagram

timeline
    title Ownership of US 5030971
    1989 : Assigned to Xerox by both inventors
    1990 : Confirmatory assignment re-recorded to Xerox
    1998 : Xerox sues HP on this patent
    1999 : Reexamination requested
         : Suit dismissed Xerox to appeal
    2002 : Security interest granted to Bank One
    2003 : Security agreement to JPMorgan Chase
    2017 : Patent expires
    2022 : Lien released back to Xerox

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NPE / troll-pattern signals

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Verdict

Operating-company assertion.

The assignment record shows the patent stayed with its operating-company originator for its entire life: it was assigned to Xerox by both inventors (reel 005187/0684, executed 1989-11-28), confirmatorily re-recorded to Xerox (reel 005463/0749, 1990-10-11), pledged twice as loan collateral — to Bank One as Administrative Agent (reel 013153/0001, 2002-06-28) and to JPMorgan Chase as Collateral Agent (reel 015134/0476, 2003-10-31) — and then released by the secured party back to Xerox (reel 066728/0193, recorded 2022-09-07). None of these is a transfer to an NPE, and none of the eight troll-pattern signals is present. The single documented assertion on this patent was by Xerox itself — a genuine competitor suing HP in 1998/1999 — which is the hallmark of an operating-company enforcement action rather than privateering. (Caveat: the "ships products embodying the claims" prong of this verdict is historically true but is weak as to Xerox's present-day product line, since current Xerox hardware is predominantly laser/solid-ink rather than thermal inkjet; on a strict "today only" reading the alternative call would be Insufficient data, but the record's substance supports operating-company assertion.)

Verify at: USPTO Assignment Center — https://assignmentcenter.uspto.gov/ (search "5030971"; the legacy interface is https://assignment.uspto.gov/patent/index.html). Reels to pull: 005187/0684, 005463/0749, 013153/0001, 015134/0476, 066728/0193 — the last four are the ones where the correspondent field should be captured, since that is the only remaining open question in this chain.

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Flags on the earlier sections

• Resolved (not contradicted): the earlier litigation section listed W.D.N.Y. 6:98-cv-06217 with parties unknown. The 1998 Xerox v. HP suit over the '971 patent is almost certainly this case; I am reporting it as a well-supported inference, not a docket-confirmed caption.
• Confirmed: the earlier note that this patent "appears as cited art, not the challenged patent," in PTAB records, and the 1999 reexamination (No. 90/005,335, filed 1999-04-20 / certificate 2000-11-28) are consistent with everything found here. I did not obtain the reexamination requester identity — the 1999 request date, sitting immediately after Xerox's 1998 suit against HP, is suggestive of a defensive filing by the defendant, but I am not asserting that.
• Uncorrected discrepancy carried forward: assignee address Stamford, CT (1991 grant) vs. Fairfield, CT (2000 reexam certificate), as flagged previously.

I'll analyze the prior art cited against US 5,030,971. Let me first verify the reference details through targeted searches, then map each to the claims.

Let me verify the remaining key references.

Prior-Art Analysis — US 5,030,971

Scope/method note. I searched for the exact identifier 5030971 / 5,030,971 and anchored the analysis to the authoritative full text you supplied (Google Patents, https://patents.google.com/patent/US5030971/en). I did not fold in similar-looking numbers (e.g., JP 5030971, FR trademark 5030971, or the "5030971" Boolean-string artifact in IPR exhibit files). Where I could not retrieve a reference's full text, I say so and identify the source of the description as either the reference title or US 5,030,971's own characterizations of it. Every date and number below is reproduced literally from the record without auto-correction (including the "May 33, 1989" date anomaly for US 4,833,491 already flagged earlier).

Important framing. The claims that matter are claim 1 (multi-color, not limited to "roofshooter" in the claim text) and claim 4 (expressly "four color roofshooter"). Both require (a) a common heater substrate with ≥2 (or 4) heater arrays each extending along substantially the entire length of its feed slot, (b) a common channel substrate whose nozzle arrays are isolated and whose nozzles sit above respective heating elements, and (c) per-array switching circuitry with more outputs than control inputs, whose inputs extend from sides perpendicular to the feed-slot direction. That (c) limitation is the differentiating core. No single cited reference dishes all of it.

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1. The 17 examiner-cited references (the "patent citations" block)

Source for the citation block and each reference's dates/assignees: the record you supplied (Google Patents, US5030971A), corroborated by targeted searches for US 4,789,425, US 4,899,181, US 4,833,491, US 4,947,192, and US 4,651,164.

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2. Non-patent literature cited in the reexamination — the most directly relevant item

Listed on the Nov. 28, 2000 reexamination certificate (US 5,030,971 B1):

D. J. Drake & W. G. Hawkins, "Precisely Aligned Four-Color Thermal Drop on Demand Ink Jet Printhead," Xerox Disclosure Journal, vol. 13, No. 2, Mar./Apr. 1988, pp. — (page numbers truncated in the record I retrieved).

• Why it matters: it is by the same inventors, on the same "precisely aligned four-color" subject matter as the patent title, and it predates the Nov. 29, 1989 filing by more than one year — i.e., it is a potential §102(b) statutory-bar reference.
• Caveat: I could not retrieve the article's full text or page range in this session, so I cannot say which claim elements it does or does not disclose. This is the single reference most worth pulling from a primary source (Xerox Disclosure Journal, vol. 13(2)) before reaching any anticipation conclusion. Xerox Disclosure Journals are typically short "disclosures," which may limit how much structure they can actually disclose.

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3. What is not prior art (do not confuse these with the citations)

• The "Cited By" / Families Citing lists (e.g., US 5,455,610; US 5,598,191; US 6,109,733; the Silverbrook and Hewlett-Packard families) are post-1989 publications — later art, not §102 prior art against this patent.
• JP 2966919 B2 / JPH03227251A is the foreign counterpart (appl. JP 2320554 A, filed 1990-11-22 claiming the same 1989-11-29 priority), not prior art.
• US 5,030,971 B1 is the reexamination certificate of the same patent, not a separate reference.

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4. Anticipation (35 U.S.C. § 102) assessment by claim

For a §102 rejection, a single reference must disclose every element. My assessment:

Claims 1 and 4 (independent) — no cited reference anticipates.

• US 4,789,425 (the roofshooter base) discloses the common heater substrate + elongated feed slot + adjacent heater array + channel substrate with nozzles, but its FIG. 1 is a passive resistor array — one addressing electrode per heater, leads run to the sides. It lacks per-array switching circuitry with outputs > inputs, and lacks the side-entry inputs. Missing elements ⇒ no anticipation.
• US 4,899,181 is monolithic and multi-array (even four-color), but its architecture is sideshooter; the claim-1 element "each nozzle… aligned above a respective heating element" is not met by an edge-ejecting geometry. Missing element ⇒ no anticipation.
• US 4,651,164 and US 4,947,192 supply active-driver/matrix addressing (arguably the "outputs > inputs" feature), but neither discloses a roofshooter printhead with elongated feed slots and a common channel substrate. Missing elements ⇒ no anticipation.
• US 4,568,953 supplies roofshooter geometry only; no multi-color single-substrate array and no switching circuitry.
• The Xerox Disclosure Journal article is the one item I cannot clear — its content must be checked.

Claim 2 / claim 5 ("switching circuitry locations alternate with feed-slot locations") — no cited reference.
This is a layout limitation specific to the invention's FIG. 3; none of the 17 references places plural switching circuits alternating between plural feed slots.

Claim 3 / claim 6 ("switching circuitry is an active driver matrix") — most exposed §102 candidates.

• US 4,947,192 (Xerox) and US 4,651,164 (Ricoh) both disclose active driver/matrix-type addressing of resistive elements from a small number of control lines. If read as teaching the "active driver matrix" species in combination with a roofshooter multi-array substrate, they are the references an examiner would pair. But as standalone references against claim 3/6 — which incorporate all limitations of parent claims 1/4 — they fall short.

Bottom line: On the record I can see, the cited art is essentially §103 (obviousness) material, not §102 anticipation art — with the caveat that the Drake & Hawkins Xerox Disclosure Journal article must be retrieved and read before that conclusion is safe, because a same-inventor, same-subject pre-filing publication is the classic §102(b) trap.

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5. Most-relevant-art ranking (for a §103 combination analysis)

1. US 4,789,425 (Drake/Xerox, 1988-12-06) — the roofshooter structural base; spec itself starts from it.
2. US 4,899,181 (Drake & Hawkins/Xerox, 1990-02-06) — monolithic multi-array, four-color, same inventors; the single closest "monolithic multi-color" teaching, distinguished only by sideshooter geometry.
3. US 4,947,192 (Hawkins & Burke/Xerox, 1990-08-07) — active driver matrix monolithically integrated with heaters; the §112/§103 anchor for the switching-circuitry element.
4. US 4,651,164 (Abe/Ricoh, 1987-03-17) — IC driver chips addressing many heaters from few lines (external second source for "outputs > inputs").
5. US 4,833,491 (Xerox, 1989-05-23) — multi-array same-color speed multiplication (spec-distinguished).
6. US 4,568,953 (Aoki/Canon, 1986-02-04) — roofshooter ejection geometry.
7. US 4,746,935 (Allen/HP, 1988-05-24) — weighted/color drop generation.

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Caveats I am not smoothing over

• I grounded dates/numbers strictly in the supplied record; several reference descriptions rely on titles or the patent's own characterizations where full text was not retrievable (US 4,812,859, US 4,887,098, US 4,791,440, US 4,914,736, and the pre-1985 Canon items).
• The Xerox Disclosure Journal page range is truncated in my source; its substantive content is unverified and it is the reference most likely to change the §102 picture.
• "Potentially anticipates" in the table means "the reference touches a claim element," not that a §102 rejection is sustainable; I have stated explicitly where an element is missing (which defeats anticipation).
• I did not have a live, primary USPTO PatentCenter/Trademark-API response in this session; the citation set is taken from the authoritative full-text record, which lists 17 cited references and the one reexamination-cited NPL item.

I'll verify the key prior-art references before building the § 103 combination analysis.

Obviousness Analysis — US 5,030,971 under 35 U.S.C. § 103

Note on the task framing: the current-task header states "Current Date: April 26, 2026," while the session header states 2026-09-29. I am flagging the inconsistency rather than silently choosing one; it does not affect the analysis, because this patent expired 2017-11-28 and I found no live 2026 proceeding in which it is the subject patent (consistent with the prior "Litigation summary" section above).

Building on prior sections. The previous sections already established the bibliographic record, the claim set (six claims; independent claims 1 and 4), the practical reading of those claims, the § 112(f) "means" anomaly, and the litigation/reexamination posture. I will not repeat those. This section assumes the four-element decomposition of claim 1 and the parallel four-element decomposition of claim 4 given earlier, and analyzes them against the Citations (17) block on the Google Patents page for US5030971A.

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I. Legal frame and the § 103 starting point

This is a pre-AIA case (effective filing 1989-11-29), so pre-AIA § 103(a) governs, as construed by Graham v. John Deere Co., 383 U.S. 1 (1966) (scope/content of prior art; differences; PHOSITA level; secondary considerations) and KSR Int'l Co. v. Teleflex Inc., 550 U.S. 398 (2007) (expansive rationales; predictable results; design incentives; "obvious to try"; no rigid teaching–suggestion–motivation requirement).

Level of ordinary skill (my assessment). A PHOSITA here would be a silicon-process/printhead engineer with ~3–5 years in thermal ink jet (TIJ) printhead design, familiar with (a) anisotropically etched silicon heater plates and the "roofshooter" vs. "sideshooter" distinction, (b) MOS/pre-AIA bipolar integration of drive transistors on a heater substrate, and (c) the ceramic/thermal-printhead driver-IC art from which the addressing techniques were borrowed. This is not a PHOSITA who would need to invent a new fabrication process — the patent's own FIGS. 5A–5G and 6A–6C concede the process is conventional.

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II. The § 103 case starts with the applicant's own admissions

This is the single most important fact in the analysis. The specification is unusually generous to a challenger:

1. The roofshooter platform is admitted prior art. "[T]he 'roofshooter' printhead disclosed in U.S. Pat. No. 4,789,425 assigned to Xerox Corporation … The heater plate has a linear array of heating elements, associated addressing electrodes, and an elongated ink feed slot parallel with the heating element array."
2. The passive array problem is admitted. "When 'passive resistor arrays' disclosed in U.S. Pat. No. 4,789,425 and shown in FIG. 1 are used, the electrical leads 33 for each resistive heating element 34 must run to the sides of the feed slot 20 and each resistive heating element 34 requires its own addressing electrode 32."
3. The multi-color objective is admitted. "For multi-colors, it is desirable to place each color array on the same chip so that they are well aligned with one another. However, a problem arises in that each heater array consumes a large amount of surface area … (referred to as silicon real estate) …"
4. The solution is admitted to be available. "An active driver matrix, such as disclosed in U.S. patent application Ser. No. 07/336,624, filed on Apr. 7, 1989, now U.S. Pat. No. 4,947,192, or U.S. Pat. No. 4,651,164, the disclosures of which are herein incorporated by reference, can be used in the present invention."
5. The multi-array technique is admitted. The 4×-frequency / 4×-resolution concept "is described in U.S. Pat. No. 4,833,491 … using multiple, separate 'sideshooter' printheads," and U.S. Pat. No. 4,899,181 "describes a monolithic multi-array, four color or monochrome printhead."

In other words, the applicant told the examiner: here is the roofshooter (Roofshooter Ref.), here is the driver matrix (Driver Ref.), here is the multi-color monolithic head (Color Ref.), here is the multi-array concept (Multi-Array Ref.) — and then claimed the combination, minus two layout limitations. That is a § 103 posture that is very difficult to defend, because the motivation is supplied by the applicant's own text.

Footnote on the § 102 status of these references (literal, not corrected):

Resolution of a date puzzle I flagged mentally earlier: the specification's "Ser. No. 07/336,624, filed on Apr. 7, 1989" and the citation table's "1988-03-07" for US4947192A are not inconsistent — my search confirms '192 is a continuation of Ser. No. 07/164,669 filed Mar. 7, 1988 (now abandoned), so both dates legitimately appear. This lowers the § 102(e) date to 1988-03-07, which is comfortably before the 1989-11-29 filing.

A legal nuance a patentee would raise: several of these are the applicant's own Xerox references, and '192 shares co-inventor Hawkins with '971. Under pre-AIA § 102(e) the reference application must be "by another," and § 103(c) (as amended by the CREATE Act) provides a common-ownership safe harbor for § 102(e)/(f)/(g) art. I would not hang the case on '192 alone: (i) '425, '164, '859, '076, '009, '440 are solid § 102(a)/(b) art carrying no "by another" problem; (ii) the '971 specification incorporates '192 and '164 by reference and affirmatively states they "can be used in the present invention," which converts them into an admission of the teachings regardless of § 102(e) status; and (iii) I would verify the CREATE Act's applicability to a 1991 grant rather than assume it. Flagged: I am not certain the § 103(c) safe harbor is unavailable on these facts, and I state that as an open question rather than a conclusion.

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III. The references, organized by claim element

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IV. Ground 1 — Claim 1 (and claims 2, 3) would have been obvious

Proposed rejection: Claim 1 is obvious over US 4,789,425 in view of US 4,947,192 (or US 4,651,164) and US 4,812,859.

Element-by-element:

Claims 2 and 5 (switching circuitry locations alternate with feed-slot locations): a layout limitation. Where N slots and N driver blocks are alternated, alternation is one of two natural orderings and follows immediately from the stated goal (minimizing the spacing between adjacent slots — the express purpose recited in the claim itself). The specification presents it with "preferably," and FIG. 3 shows it as a mechanical arrangement. Under KSR, "a court must ask whether the improvement is more than the predictable use of prior art elements according to their established functions." Alternating blocks is the paradigm of a predictable arrangement of elements. Obvious.

Claims 3 and 6 (switching circuitry is an active driver matrix): expressly and unambiguously met. The specification identifies '192 and '164 as "an active driver matrix … [which] can be used in the present invention," and FIG. 3A depicts a gate/source MOS matrix. Obvious — indeed, this is the species the specification admits to using.

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V. Ground 2 — Claim 4 (and claims 5, 6) would have been obvious

Proposed rejection: Claim 4 is obvious over US 4,789,425 in view of US 4,947,192 (or US 4,651,164) and US 4,812,859, and further in view of US 4,630,076 / US 4,750,009 / US 4,914,736.

Claim 4 is claim 1 with the number "two" replaced by "four" and the word "roofshooter" added. The added "four" is directly met by '859 — whose multichamber pen is expressly described as providing "the isolated storing of four colors of ink" and whose printhead comprises "a plurality of nozzle groups corresponding in number to the number of chambers… in communication with the individual chambers for receiving ink." '076 and '009 supply per-color nozzle groups with plural nozzles per color; '736 supplies multiple liquid chambers on a single substrate. The "roofshooter" limitation is met by '425, and '971's own specification concedes that '425 is a roofshooter and that '181 is the same monolithic multi-array concept in a sideshooter — so selecting the roofshooter variant is the only remaining choice, made for the known reason (through-the-heater-plate ink feed; proximity of paper; electrode passivation considerations, all discussed in the '971 specification).

Ground 2 is, if anything, stronger than Ground 1, because it eliminates any argument that "at least two" was selected without direction: the prior art explicitly targets four colors.

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VI. Motivation to combine, and why the combination is not a "mere aggregation"

A. Same field of endeavor / reasonably pertinent to the problem. All of '425, '859, '736, '076, '009, '181, '491, '192 are thermal (or drop-on-demand) ink jet printhead references — same field. '164 is a thermal print head using resistive heater elements and driver ICs; it is reasonably pertinent under the second In re Bigio branch because the problem it addresses (driving a dense linear array of heaters from few terminals) is the identical problem '971 addresses, and because the applicant itself cited it as the operative enabling disclosure. That citation forecloses a non-analogous-art argument.

B. The rationales (MPEP 2143 / KSR family):

1. Combining prior art elements according to known methods to yield predictable results. '425 gives the platform; '192 gives integrated MOS drivers on the same substrate ("Preferably, the drive circuitry should be formed on the same chip as the resistive elements" — '192's own words); '859 gives per-color chambers and isolated nozzle groups. Wiring an integrated driver matrix to an array of resistors is precisely the established function of both.
2. Simple substitution of one known element for another. Substitute the passive resistor array of '425 (one pad per heater; leads "must run to the sides") with the active matrix of '192/'164. Both are known means of energizing a resistive heater; the substitution yields the known benefit (fewer pads → less area), which '192 states in terms.
3. Use of a known technique to improve a similar device in the same way. '491 and '181 used multiple arrays in a head to get 4× speed/resolution; applying the same technique to the roofshooter platform is exactly what the '971 specification says it did.
4. Design incentive / market pressure. The specification's own stated drivers: "high quality, high speed printing," silicon real estate economy, drop-to-drop alignment, and an "inexpensive four-color disposable 'roofshooter' thermal ink jet printhead." The prior art supplies the same pressures ('859: retrofittable color capability; '192: "as the size of an integrated circuit increases, manufacturing cost rises rapidly both because greater area of material is consumed and yield falls").
5. Obvious to try. Given a finite number of identified, predictable solutions to the acknowledged silicon-area/alignment problem — (a) shrink the driver by multiplexing (known), (b) shrink the number of slots, (c) split into banks (the '971 FIG. 2 admission, which the specification says requires two scan lines of storage) — choosing (a) and applying it to a single bank was "obvious to try" with a reasonable expectation of success.

C. Reasonable expectation of success. The specification supplies it by concession: the heater plate is fabricated by the '425 process (FIGS. 5A–5G) with driver matrices "fabricated on the surface in a manner disclosed in U.S. Ser. No. 07/336,624 … or U.S. Pat. No. 4,651,164" (FIG. 5E), and the channel substrate by the '425 method (FIGS. 6A–6C, citing DuPont VACREL, dry-film photoresist, etc.). There is no disclosed unexpected result, no criticality of any parameter, and no working example that failed before succeeding. The only "novelty" offered is that the combination saves area — the precise result each secondary reference already promised.

D. "Bodily incorporation" is not the test. A patentee will argue that '859 (an HP interchangeable-pen multichamber head), '736 (Canon), and '164 (a Ricoh wax-transfer thermal head with external IC chips on tape carriers) cannot be physically inserted into the '425 roofshooter. That argument fails: the test is what the combined teachings suggest to a PHOSITA, not whether one reference can be bodily incorporated into another. In re Keller, 642 F.2d 413 (CCPA 1981); In re Merck & Co., 800 F.2d 1091 (Fed. Cir. 1986). '164 need not be built into the '425 plate — it need only teach that a linear resistive heater array can be driven by an address-decoding driver stage having far fewer inputs than outputs, which it plainly does.

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VII. Where the § 103 case is genuinely weak (the honest counter-case)

I do not want to present this as a slam dunk. Three points deserve emphasis:

1. The side-entry-inputs limitation is the real battleground. Claim 1 and claim 4 both require that "each of said switching circuitry means includes opposite sides which extend substantially perpendicular to a direction in which each feed slot extends, and … said inputs extend from said sides." No reference in the Citations (17) block appears to disclose this orientation with respect to a roofshooter feed slot. The closest is FIG. 3A of '971 itself (gate pads left, source pads right) and '181's bonding-clearance statement. A patentee's best argument is that this is a spatial-orientation limitation that is not merely a design choice, because it is the thing that permits multiple slots in one bank. The counter is KSR/MPEP 2144.04: placing I/O pads where they do not obstruct the ink slots is a predictable, result-oriented placement for which the patent discloses no unexpected consequence — and the '971 specification's own FIG. 3A shows the matrix's gate and source pads already on opposite sides of the matrix. This is a § 103 "predictable variation" call, and different decision-makers could reasonably reach different results. I would not predict the outcome.
2. Claim-drafting vulnerability cuts both ways. As flagged earlier, "switching circuitry means" invites § 112(f) treatment (Williamson v. Citrix Online, LLC, 792 F.3d 1339 (Fed. Cir. 2015) (en banc)). If construed under § 112(f) with '192/'164 as the corresponding structure, the claim narrows — which helps a § 103 challenger (the claim then covers the matrix of '192/'164 and equivalents). If instead the "means" is not treated as § 112(f) (because the claim also recites structure), the claim is broader and the '164/'192 combination reads on it even more cleanly. I see no construction under which this term helps the patentee on obviousness.
3. Reference date and "by another" issues. As noted in § II, '192's § 102(e) date is complicated by the continuation lineage and the common-inventor/common-assignee facts, and the CREATE Act safe harbor's applicability to a 1991 grant is something I would verify rather than assert. The rejection should therefore be built primarily on '425 (solid § 102(b)) + '164 (solid § 102(b)) + '859 (issued 1989-03-14, § 102(a)/(e)), using '192 as corroboration and as an admission.

Anticipated patentee rebuttal and my response:

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VIII. Secondary considerations

There are none of record that I can support. The prior sections note no commercial-success, long-felt-need, licensing, or industry-praise evidence in the file. Points to watch:

• Reexamination (90/005,335, effective 1999-04-20; certificate US5030971B1, 2000-11-28). Survival of claims through a ex parte reexamination is, at most, weak evidence — it is not a Graham factor, the examiner's prior-art search was limited, and the board of the analysis here is a multi-reference § 103 combination that ex parte reexamination frequently handles differently than litigation. I could not verify from the fetched record whether the B1 certificate amended the claims; if it did, this entire analysis must be re-run against the amended claim set. I flag that as an unresolved dependency.
• Nexus problem. The patent's commercial aspiration (a disposable four-color roofshooter head) could in principle anchor a commercial-success story, but "the patent's own goal statement" is not evidence of success and, even with sales data, nexus would have to be shown to the side-entry-input routing, not to the general concept of multi-color TIJ.
• Skepticism / teaching away. I found nothing in the Citations (17) block that teaches away from integrating driver matrices on a roofshooter heater plate. If anything, '192's "Preferably, the drive circuitry should be formed on the same chip as the resistive elements" is a teaching toward.

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IX. Bottom line

The single limitation that gives this patent any realistic prospect of surviving a § 103 challenge is the requirement that the switching circuitry's inputs extend from opposite sides running perpendicular to the feed-slot direction. Everything else in independent claims 1 and 4 is disclosed in, or rendered obvious by, references the applicant itself identified, characterized, and expressly incorporated. A challenger should attack the side-orientation limitation as a predictable, result-driven layout choice under KSR; a patentee should defend it as a specific spatial solution to a specific slot-packing problem.

Confidence and caveats I am deliberately not smoothing over:

• Element mappings for '425, '192, '859, and '164 are grounded in the documents I retrieved (URLs above). Mappings for '181, '491, '098, '440, '736, '076, '009, '935 are grounded in their titles/front-page data and, where available, the applicant's characterization of them in the '971 specification — I did not read the full text of each, and I say so rather than implying otherwise.
• I have not verified the claim set actually in force after the 2000 B1 certificate.
• I have not resolved whether § 103(c)/CREATE Act common-ownership could remove '192 as prior art; I flag it as unverified rather than asserting either way.
• The "granted May 33, 1989" typo for US 4,833,491 in the '971 specification (front page: 1989-05-23) is noted literally and is not relied on; either date places '491 in the § 102(a)/(e) window.