US 6030074

I'll check live sources for any litigation or docket activity before summarizing.

Let me try a few additional targeted queries to make sure nothing is being missed.

US 6,030,074 — Summary

Caveat on sourcing: Live searches returned no CAFC 2026 docket activity, ITC action, or district-court litigation naming 6,030,074 specifically. An ITC/enforcement search surfaced HP cartridge-patent campaigns, but those involved other patents (e.g., 6,089,687; 6,264,301; 6,954,985; 7,104,630; 6,454,381) — none is '074, and I am not attributing any of those cases to this patent. Treat "no litigation found" as absence of evidence, not proof of none.

Bibliographic data (from the authoritative full text + Espacenet biblio)

Family/related filings listed: continuation-in-part US 6,290,343 and US 6,874,872 ("Monitoring and controlling ink pressurization in a modular ink delivery system"); related continuations US 6,074,042 and US 6,206,512.

Abstract (verbatim)

"An apparatus for delivering pressurized ink to a printhead, according to the invention, includes a deformable bag for holding ink, a pressurizable container substantially surrounding the bag for exerting fluid pressure on said bag and pressurizing any ink within the bag, and a sealable ink outlet port for fluid communication with the ink bag. The port is fluidically connectable to the printhead so that pressurized ink is deliverable to the printhead."

Important drafting note: the abstract and the written description describe the invention in terms of a "sealable ink outlet port," but the granted claims do not recite that element. The claims instead center on the interaction between a print-cartridge pressure regulator (negative/back pressure) and an externally pressurized bag-in-a-rigid-container supply. Disclosure and claim scope therefore diverge noticeably — a point relevant to any infringement or validity reading.

Independent claims — plain language

There are 11 claims; three are independent — claim 1 (system), claim 6 (method), and claim 11 (ink supply article), all sharing the same core architecture.

Claim 1 — Pressurized ink delivery system. Three cooperating parts:

1. Print cartridge with a printhead, plus a pressure regulator between the cartridge's ink input and the ink outlet feeding the printhead. The regulator senses negative pressure (relative to atmosphere) in the cartridge that is more negative than a preset limit, and lets ink flow in until pressure is back within a preset negative range.
2. Ink supply made of: a deformable ink bag holding the ink; a rigid container substantially surrounding the bag; and an ink supply tube from bag to cartridge ink input.
3. Pressurizing device (e.g., pump) whose outlet connects to the rigid container, generating positive pressure inside the container so ink is pushed to the cartridge input "at all times while said printhead is operating."

The gist: a two-stage pressure scheme — positive pressurization of the bag from outside, then on-cartridge regulation back down to a controlled negative back pressure. One pressurizer can serve multiple reservoirs (the spec notes a color machine with four).

Claim 6 — Method. Same hardware, recast as steps: provide the print cartridge/regulator assembly; operate the printhead to print on a medium; generate a negative pressure inside the cartridge as it prints; provide the bag-in-rigid-container supply with pressurizing device; and feed ink at positive pressure through the supply tube to the cartridge input while printing.

Claim 11 — Pressurized ink supply (article claim). Claims the supply side alone, with the print cartridge/regulator recited as the environment ("said ink jet printer including a print cartridge comprising a printhead and a pressure regulator..."), comprising the deformable bag, the rigid surrounding container, the ink supply tube, and the pressurizing device delivering ink to the cartridge input at positive pressure at all times while the printhead operates.

Orphaned antecedent note: claim 11 recites "a deformable ink bag containing said ink," yet the ink is only introduced in the preamble's environment description — worth flagging as a possible indefiniteness/correction-history issue rather than reading "said ink" as a claim element. (Claim 11 also contains the typo "An pressurized ink supply.")

Dependent claims

• 2 — pressurizing device continuously operates to supply ink at positive pressure while printing.
• 3 — depends from 2; adds a bleed valve on the rigid container venting to atmosphere when internal pressure exceeds a preset level.
• 4 — pressurizing device is a pump, electrically activated while printing.
• 5 — printhead is part of an inkjet printer; operation = expelling ink droplets.
• 7, 8, 9, 10 — method counterparts to 2, 3, 4, 5 (continuous operation; bleed valve; pump; droplet expulsion).

Embodiments disclosed (specification support)

• FIG. 1 (main embodiment): rigid air-impermeable container (10) over a deformable bag (13) of multi-layer metallized PET with an LDPE sealant layer; HDPE chassis (19) and diamond-shaped fin (22) joined by ultrasonic welding/heat staking/adhesive; FEP conduits; first and second quick-disconnect valves (43, 67) for ink and gas; air manifold (61) with bleed vent (ball 92/spring 93) for continuous bleed; compressor (76) at ~2 psi and ~150 cc/min.
• FIG. 3 (alternative): a septum (112) in the container sidewall pierced by a hollow needle (128) fed from a pressurized fluid cylinder (118) through a regulator (131) set to ~2 psi — i.e., no on-board compressor.
• Ranges stated: back pressure preset of −2 inches of water (any other back pressure contemplated); system pressures from −10 in. water to over 45 psi.

Confidence and open items

• Bibliographic data, abstract, claims, and description: high confidence — taken directly from the authoritative Google Patents full text and corroborated by the Espacenet biblio record (inventor Barinaga; applicant Hewlett-Packard; app. US19970988018; priority US19960679579; abstract identical).
• Assignee chain: moderate-to-high — based on the recorded assignment events in the document; I have not independently verified the current chain against USPTO Assignment records.
• Litigation/CAFC status: no authoritative information found. Searches for the number plus 2026 CAFC dockets returned nothing; do not infer that the patent was or was not litigated. Note the patent expired 2016-07-15, so post-2016 appeals would relate to damages tails or related-family patents rather than ongoing infringement of the '074 claims.
• The "FIG. 2" reference in the FIG. 3 embodiment discussion appears to be a typographical error in the specification (it should read FIG. 3); reported literally, not corrected.

Sources: https://patents.google.com/patent/US6030074/en · https://be.espacenet.com/publicationDetails/biblio?DB=EPODOC&CC=US&NR=[6030074A](/patent/6030074A)

I'll research litigation involving US Patent 6,030,074. Let me run several targeted searches.

Summary of Findings: Litigation Involving U.S. Patent No. 6,030,074

Bottom line: I found no litigation specifically asserting or involving U.S. Patent No. 6,030,074 in the sources I could search.

To be transparent about method and limits: I ran targeted queries against the Unified Patents patent/litigation portal, CourtListener, and general web results, and looked for the specific string "6030074" / "6,030,074" in connection with infringement complaints, ITC Section 337 investigations, and district court or Federal Circuit cases. My access to PACER and the CAFC docket directly was limited in this session, so my conclusion rests on the searches I was able to run.

What I found about the patent itself

• U.S. Patent 6,030,074 — "Method and Apparatus for Delivering Pressurized Ink to a Printhead." Inventor: John Barinaga. Original assignee: Hewlett-Packard Company; current assignee per Unified Patents: Hewlett-Packard Development Co LP. Priority date 1996‑07‑15; application 08/988,018 filed 1997‑12‑10; granted 2000‑02‑29. Status: Expired – Lifetime, with anticipated expiration 2016‑07‑15.
• Unified Patents patent page: https://portal.unifiedpatents.com/patents/patent/US-6030074-A — this page lists referenced-by and family data but no litigation entries appeared in the results.

HP enforcement activity that does NOT involve this patent (checked and distinguished)

Because HP (the assignee) was active in ink-supply patent litigation, I checked the major campaigns to see whether the '074 patent appeared. It did not:

1. ITC Inv. No. 337‑TA‑581, In the Matter of Certain Inkjet Ink Supplies and Components Thereof — complaint filed Aug. 1, 2006 (amended Aug. 18, 2006), instituted Aug. 29, 2006; complainant Hewlett-Packard Company; respondents Ninestar Technology Co. Ltd., Ninestar Technology Company Ltd., Aurora Eshop, Inc. (butterflyinkjet.com), IowaInk, LLC, L2 Commerce, Inc. (PrintMicro.com), and All Media Outlet Corp. (Inkandbeyond.com). Patents asserted: 5,825,387; 6,793,329; 6,074,042; 6,588,880; 6,364,472; 6,089,687; and 6,264,301. Note that 6,074,042 is a different patent number from 6,030,074 and is not the patent at issue here. (Fed. Reg. 71 FR 52576, Sept. 6, 2006.)
2. HP v. Gateway (S.D. Cal., filed March 2004) and HP v. Acer (E.D. Tex.) — computer hardware patents, not ink delivery, and not the '074 patent.

Any resemblance between the '074 patent here and the "6,074,042" reference in the ITC case is coincidental; per your instruction I am treating those as distinct identifiers and not conflating them.

Case table

Caveats and suggested next steps

• Absence of evidence here is not definitive proof that no case ever existed. A patent that expired in 2016 and that appears to have been licensed widely within HP's own product ecosystem may simply never have been separately litigated.
• If you need a definitive negative, the authoritative checks would be: (a) PACER/RECAP full-text docket search for "6,030,074" and "6030074"; (b) the Unified Patents litigation caselist at https://portal.unifiedpatents.com/litigation/caselist; (c) CAFC docket search for the patent number; and (d) a commercial database (LexisNexis, Docket Navigator, Westlaw Litigation Analytics).
• I could not complete these direct database lookups within this session; I can pursue them further if you'd like.

If you have a lead suggesting a specific case (e.g., a defendant or court), share it and I'll try to verify that specific docket.

I'll verify the "no proceedings on file" default against public sources before drafting.

The first pass returned only unrelated hits (the Cuozzo/Garmin '074 is US 6,778,074, a different patent). Let me run more targeted checks.

PTAB / AIA Trial Analysis — U.S. Patent No. 6,030,074

Verification note up front (read this before relying on the "zero"): The canonical structured block supplied with this prompt states that the USPTO Open Data Portal returns no AIA trial proceedings for this patent. I attempted to corroborate that with public web searches for IPR/PGR/CBM activity, PTAB decisions, and ex parte reexamination activity tied to "6,030,074" / "6030074." Every hit returned was for a different patent — most prominently US 6,778,074 (Cuozzo/Garmin, the famous In re Cuozzo IPR2012‑00001 case). That is a distinct patent number and I am not conflating it. I hit a tool-call limit before I could complete direct PTAB E2E / Docket Alarm / RECAP lookups, so the search corroboration is supportive but not exhaustive. The conclusion below rests primarily on the ODP structured data, which is the canonical list.

Proceedings overview

Total AIA trial proceedings on file for US 6,030,074: zero — 0 active, 0 with claims invalidated, 0 with claims sustained, 0 settled, 0 institution denials; consequently all 11 claims (1–11) are UNTESTED at the PTAB, and the defensive posture for a defendant is not "the patent is hardened" but the far simpler one: the patent expired on 2016-07-15 and carries no forward-looking infringement exposure — while its still-live-looking family members (US 6,290,343, US 6,874,872, US 6,074,042) are where any real assertion risk has historically sat.

{No proceeding number} — No petitioner v. Hewlett-Packard

There is no proceeding to caption. Rather than fabricate one, here is the negative finding and what it means:

• Type: N/A — no Inter Partes Review, Post-Grant Review, or Covered Business Method review was ever filed or instituted against 6,030,074.
• Filed: N/A.
• Status: N/A. The patent's own legal status is Expired – Lifetime (anticipated expiration 2016-07-15, per the Google Patents record and the ODP-derived status).
• Judge panel: N/A — no panel ever convened.
• Petition grounds: N/A.
• Institution decision: N/A.
• Final Written Decision: N/A. No claim of 6,030,074 has ever been canceled, confirmed, or construed by the Board. Do not represent otherwise to a court or an adversary.
• Settlement / termination: N/A.
• Appeal: N/A.
• Defensive value: The absence of any IPR is itself the signal. US 6,030,074 was in force for roughly 14 years of post-AIA eligibility (AIA trials became available 2012-09-16; the patent expired 2016-07-15), including four years in which any competitor shipping a pressurized off-axis ink bag system could have petitioned. Nobody did. Combined with expiration, an IPR-based defense is neither available nor necessary: the correct defense is expiration, not invalidity. If a demand letter cites 6,030,074, verify the date — the enforceable window closed on 2016-07-15, subject only to the six-year pre-suit damages lookback under 35 U.S.C. § 286 for past conduct.

Strategic summary

Claim status across the patent. All eleven claims — independent claim 1 (pressurized ink delivery system), dependent claims 2–5, independent claim 6 (method), dependent claims 7–10, and independent claim 11 (pressurized ink supply) — are UNTESTED. There are no CANCELED claims and no SUSTAINED claims, because no tribunal ever reached the merits. This is unusually clean for a patent this old: there is no adverse claim-construction record, no prosecution-history-disclaimer-by-IPR, and no 315(e) estoppel attaching to any party. But it is also cold comfort to a patent owner, because the claims are expired and the only remaining theory is retrospective damages for conduct before 2016-07-15 — and only for the six years preceding the filing of any complaint, which for a suit filed today would reach back no further than approximately 2020, i.e., after expiration. Practically, that math likely yields no recoverable damages period at all.

Estoppel landscape. Because no IPR/PGR was ever instituted, no petitioner or privy is subject to § 315(e)(1) or § 315(e)(2) estoppel on this patent. Every prior-art ground — including grounds that would otherwise be "reasonably could have raised" in an IPR — remains fully available in any district court or ITC forum for whatever residual purpose it may serve. Conversely, there is no PTAB record a patent owner could cite under § 325(e) either. For a defendant, the strategic takeaway is that you face no estoppel ceiling and no estoppel floor — but you also have almost nothing to gain from an AIA petition. Note two mechanical realities if someone nevertheless contemplates an IPR on an expired patent: (a) the Board has historically permitted review of expired patents, but the practical remedy is retrospective only, and (b) claim construction for expired patents is governed by the Phillips framework under 37 C.F.R. § 42.100(b) as amended in 2018, not the BRI standard that was applied in the pre-2018 regime. Ex parte reexamination under 35 U.S.C. §§ 301–307 remains theoretically available to any third party at any time, but it, too, is a low-value play against a claim set whose enforcement window has closed.

Pattern signals. No repeat-petitioner pattern (no petitioners at all). No patent-owner appeal pattern (nothing to appeal). No defensive aggregator involvement — Unified Patents' portal page for this patent at https://portal.unifiedpatents.com/patents/patent/US-6030074-A lists family and citation data but no IPR/PGR/CBM or reexamination entries, consistent with the ODP result. The reason is straightforward: Unified and similar entities target patents being asserted, and 6,030,074 was never the asserted patent. HP's actual enforcement in this technology space ran through sibling patents, not through 6,030,074.

Cross-reference refinement to the earlier litigation section

The prior litigation summary stated, correctly as to patent identity, that the ITC complaint in Inv. No. 337‑TA‑581 asserted US 6,074,042 and that this is "a different patent number from 6,030,074," treating the resemblance as coincidental. Flagging a factual refinement, not a contradiction: the resemblance is not coincidental. US 6,074,042 ("Ink container having a guide feature for insuring reliable fluid, air and electrical connections to a printing system") issued from application 08/871,566, filed 1997-06-04, which shares the same 1996-07-15 priority date and the same Barinaga-era HP ink-delivery family tree as 6,030,074 (per the related-application data on the face of US 6,874,872). They are specification siblings, not the same patent. Likewise:

• US 6,290,343 — from application 09/495,666, filed 2000-02-01, a continuation‑in‑part of 08/988,018 (i.e., a direct child of 6,030,074).
• US 6,874,872 — from application 09/912,406, filed 2001-07-24, a continuation of 09/495,666, and therefore a grandchild of 6,030,074.

This matters defensively: a defendant facing an HP ink-delivery assertion should expect the assertion to be built on 6,074,042, 6,290,343, 6,264,301, or 6,874,872, which have later priority/filing dates and correspondingly later expirations, rather than on the expired 6,030,074. Note also that the earlier section used Google Patents dates (priority 1996‑07‑15, filed 1997‑12‑10, granted 2000‑02‑29), while the Unified Patents portal record shows off-by-one values (priority 1996‑07‑14, application 1997‑12‑09, grant 2000‑02‑28, expiration 2016‑07‑14). I cannot resolve that one-day discrepancy from the sources available; for an IPR or litigation deadline calculation, confirm against USPTO Patent Center / the printed patent rather than either metadata aggregator.

Recommended next steps

1. Run the definitive negative yourself, because I could not finish it. Search PTAB E2E (https://ptab.uspto.gov/) and Docket Alarm / RECAP for "6030074" and "6,030,074," and check the Unified Patents caselist at https://portal.unifiedpatents.com/litigation/caselist. If a filing surfaces, it will almost certainly be dated 2012‑09‑16 through 2016‑07‑15 (the only meaningful window before expiration), and any FWD must be quoted at claim-level granularity before you rely on it.
2. If you are defending an assertion of 6,030,074 specifically: the dispositive fact is expiration on 2016-07-15 (anticipated; confirm against the printed patent). A patent that expired in 2016 cannot support injunctive relief and supports damages only for acts before expiration and within the § 286 six-year lookback. Ask the asserting party to state its damages period on the record.
3. If you are defending an assertion in this family (more likely): re-run this PTAB analysis against 6,074,042, 6,264,301, 6,290,343, and 6,874,872 individually. Those are the patents with live or recently-live terms, and they — not 6,030,074 — are the ones with actual enforcement history (per the ITC 337‑TA‑581 record described in the prior section). Any IPR clock or § 315(b) one-year bar analysis must be run on those numbers, not this one.
4. If you are a patent owner considering enforcement: note that your own § 315(e) estoppel exposure is nil on this patent, but so is your leverage. The absence of any PTAB challenge here is a signal of low commercial interest, not of hardened claims — well-asserted patents eventually attract IPRs, and this one never did despite four years of availability.

Constraint compliance: No proceeding number has been invented; every field above that would require a proceeding record is marked N/A rather than filled speculatively. No FWD is quoted because none exists. All dates are YYYY-MM-DD.

I'll research the assignment record before drafting. Let me run several targeted searches.

Let me dig deeper for the initial inventor assignment and any security/license records.

Assignment / Ownership Analysis — US 6,030,074

Sourcing caveat up front (read alongside the prior sections' caveats): the USPTO Assignment Center UI at https://assignmentcenter.uspto.gov/ is a JavaScript application that I could not query directly in this session. My reconstruction therefore rests on (a) the recorded-assignment entries in the Google Patents legal-events table for https://patents.google.com/patent/US6030074/en, (b) Espacenet INPADOC legal-status records that expose the same reel/frame data for this patent and its siblings, and (c) a USPTO PTAB filing that reproduces a legal-events table containing the reel 026945/0699 entry verbatim. I did not retrieve the correspondent-of-record field or a separate inventor→HP assignment record. Where I lack data I say so rather than infer. This is a recorded-events reconstruction, not a certified copy of the Assignment Abstract of Title.

Inventors

• Sole inventor; no joint inventors on the '074 file.
• Unusual-pattern check — not present. Barinaga did not depart the assignee. He is a prolific HP inventor (Unified Patents/Radaris indexes 53–55 US patents; Typeset lists 55 publications, 1,415 citations), and his later filings remain HP-assigned well past this patent — e.g., appl. 11/082,093 (filed 2005, granted 2009 as US 7,540,583) is assigned to Hewlett-Packard Development Company, L.P. A 10-plus-year post-filing trail of HP-assigned applications is the opposite of the "inventors leave within 12 months, portfolio later fire-sold" tell.
• Minor data discrepancy worth logging: his residence is given as Vancouver, WA on the '074 front page but Portland, OR on sibling HP patents. Cosmetic, not an ownership issue.
• Contradiction flag vs. prior sections: none. The prior summary's inventor field (John Barinaga) is confirmed.

Original assignee

Hewlett-Packard Company, Palo Alto, California (California corporation at issuance), per the '074 front page and the Espacenet biblio record ("Aanvrager(s): HEWLETT PACKARD CO [US]").

• Line of business: HP was, at issue (2000-02-29), the dominant operating company in desktop and large-format inkjet printing; the '074 specification's stated motivation — "large format" CAD, mapping, graphic-arts and poster plotting, and off-board ink reservoirs — maps directly onto HP's then-current DesignJet large-format plotter line. (Confidence: moderate. The specification alignment is clear from the text; I have not independently verified a specific model number as an embodiment of the granted claims.)
• Did the original assignee ship a product embodying the claims? Substantively yes — HP built and sold off-axis/off-board pressurized ink-delivery large-format inkjet systems in this era, and the family shows continuous commercial exploitation (the child patents US 6,290,343 / US 6,874,872 are directed to monitoring and controlling ink pressurization in a modular ink delivery system, i.e., refinement of the same shipping architecture). I flag this as an operating-company product signal, not as a claim-chart conclusion.
• Current status of the named entity: Hewlett-Packard Company no longer exists as an independent registrant. It reincorporated in Delaware via the merger recorded at reel 011523/0469 (effective 1998-05-20), then transferred IP into Hewlett-Packard Development Company, L.P. (effective 2003-01-31, reel 026945/0699). HP later split on 2015-11-01 into HP Inc. (printing/PC, the relevant successor here) and Hewlett Packard Enterprise. Unified Patents lists the patent's parent company as HP Inc. (Note: the 2015 split was a spin-off/reorganization, not a bankruptcy or asset sale of the patent estate.)

Assignment timeline

Two post-issuance corporate recordings exist. Both are bulk portfolio reels, not patent-specific conveyances — the same reel/frame pair appears in Espacenet INPADOC for unrelated HP patents (e.g., reel 011523/0469 on US 5,988,802, US 5,980,622, US 5,107,332; reel 026945/0699 on US 6,435,653 B1). That matters for the NPE analysis below.

• 1998-05-20 (executed) / recorded 2001-01-16 — Reel 011523/0469

  • Conveyance: Merger
  • Assignor: Hewlett-Packard Company
  • Assignee: Hewlett-Packard Company (Colorado — i.e., the Delaware reincorporation survivor; address of record "Colorado")
  • Correspondent: Not retrieved. I could not obtain the correspondent field for this reel/frame.
  • Context: Internal corporate reorganization — HP's 1998 Delaware reincorporation, recorded ~2.7 years after the effective date as part of a mass re-recording of the HP patent estate. Not an acquisition, sale, or securitization.

• 2003-01-31 (executed) / recorded 2011-09-22 — Reel 026945/0699

  • Conveyance: Assignment (Assignment of Assignors' Interest)
  • Assignor: Hewlett-Packard Company
  • Assignee: Hewlett-Packard Development Company, L.P., Houston, TX
  • Correspondent: Not retrieved.
  • Context: Internal reorganization / intra-group IP consolidation — HP's standard transfer of the operating patent estate into its Houston-based IP-holding subsidiary. Note the ~8.6-year lag between execution (2003) and recording (2011), characteristic of a bulk "clean-up" recording rather than a transaction-driven filing.
  • Corroboration: A USPTO PTAB filing reproduces the legal-events table showing "HEWLETT-PACKARD DEVELOPMENT COMPANY L.P., HOUSTON, TX, US / HEWLETT-PACKARD COMPANY / 2003-01-31 / 026945/0699 / 2011-09-22" — independent confirmation of the execution/record/address fields. (https://ptacts.uspto.gov/ptacts/public-informations/petitions/[1502434](/patent/1502434)/download-documents)

Records NOT found (state plainly, do not infer):

1. No inventor→HP assignment record surfaced. I could not retrieve a reel/frame for Barinaga's original assignment to Hewlett-Packard Company, which one would ordinarily expect in the Assignment Center history for a 1997-filed application. Either it was not indexed in the sources I could reach, or it exists on a reel I could not query. Not a finding either way.
2. No security agreement, license, release, or correction records surfaced for this patent.
3. No transfer to any entity outside the HP corporate family has ever been recorded. There is no third-party assignee anywhere in the chain.

Corroboration discrepancies to log (do not auto-correct): Unified Patents' page for this patent (https://portal.unifiedpatents.com/patents/patent/US-[6030074](/patent/6030074)-A) lists dates one day earlier than the authoritative Google Patents text and Espacenet — priority 1996-07-14 vs. 1996-07-15, application 1997-12-09 vs. 1997-12-10, grant 2000-02-28 vs. 2000-02-29, expiry 2016-07-14 vs. 2016-07-15. It also reports "Lifetime Renewal Fees: $0," which conflicts with the three recorded maintenance-fee payments in the Google Patents legal events (year 4 on 2003-08-29; year 8 on 2007-08-29; year 12 on 2011-08-29). Treat Unified's fee field as a data artifact.

Timeline diagram

timeline
    title Ownership of US 6030074
    1996 : Parent application filed by Barinaga
    1997 : Continuation application filed
    1998 : HP merger effective May 20
    2000 : Patent issued Feb 29
    2001 : Merger recorded Reel 011523 frame 0469
    2003 : Transfer to HP Development effective Jan 31
    2011 : Recorded Reel 026945 frame 0699
    2016 : Patent expired Jul 15

NPE / troll-pattern signals

Score: zero strong signals, zero weak signals supporting NPE/PAE status.

Verdict

Operating-company assertion (ownership prong only — the assertion prong is expressly NOT satisfied; see the qualification)

The entire recorded chain is intra-HP: Hewlett-Packard Company → Hewlett-Packard Company (Delaware, merger effective 1998-05-20, reel 011523/0469) → Hewlett-Packard Development Company, L.P. (effective 2003-01-31, reel 026945/0699). No third party, no NPE, no shell LLC, no aggregator ever appears, and none of the eight troll-pattern signals is present. Qualification, stated plainly so it is not misread: the "Operating-company assertion" label is selected only because the chain's terminal holder is the original manufacturer's operating group, which still practices this ink-pressurization architecture; there is no evidence that US 6,030,074 was ever asserted, and the assertion element of that label is unmet. If the required taxonomy is applied strictly, the patent is best described as operating-company-held and non-asserting — and if a single label must be forced, the honest alternative is that none of the five options fits cleanly. It is definitively not an NPE chain at any confidence level.

Confidence in the non-NPE conclusion: high (two bulk corporate reels, same corporate family, no third-party assignee, operating-company terminal holder). Confidence in the completeness of the assignment history: moderate — I could not retrieve the correspondent fields or an original inventor→HP assignment record, and I could not query the Assignment Center application directly.

Verify at: https://assignmentcenter.uspto.gov/ (or the legacy index https://assignment.uspto.gov/patent/index.html) — search by patent number 6030074; expect the two bulk reels 011523/0469 and 026945/0699. Cross-check the same reels on Espacenet INPADOC at https://worldwide.espacenet.com/patent/search?q=pn%3DUS6030074 and Google Patents legal events at https://patents.google.com/patent/US6030074/en.

I'll verify the citation record for US 6,030,074 and pull details on each cited reference.

Prior-Art Analysis — US 6,030,074 (Barinaga/HP, "Method and apparatus for delivering pressurized ink to a printhead")

1. Patent verified (specific number, no similar-number substitution)

I searched the specific number 6030074 (not 6030075, 6030374, 6074042, etc.). All hits resolve to the same document, confirming the earlier-generated sections:

• US 6,030,074 A (US6030074A) — "Method and apparatus for delivering pressurized ink to a printhead"; inventor John Barinaga; original assignee Hewlett-Packard Company; app. 08/988,018 filed 1997-12-10; priority 1996-07-15 (continuation of 08/679,579); granted 2000-02-29; CPC B41J2/175.
• Sources: https://patents.google.com/patent/US6030074/en · https://be.espacenet.com/publicationDetails/biblio?CC=US&NR=[6030074A](/patent/6030074A) (confirms inventor, app. US19970988018/19971210, priority US19960679579/19960715, identical abstract) · https://portal.unifiedpatents.com/patents/patent/US-6030074-A

Contradiction flagged (data hygiene): Unified Patents lists priority 1996‑07‑14, application 1997‑12‑09, grant 2000‑02‑28 and examiner "Le, N.; Vo, Anh T. N." — one day earlier than the authoritative Google Patents full text and Espacenet, which both show 1996‑07‑15 / 1997‑12‑10 / 2000‑02‑29. Per the operating rules I treat the full text/Espacenet dates (07‑15/12‑10/02‑29) as ground truth and note the Unified Patents entry as an apparent off-by-one data error. It does not affect the analysis below.

Effective dates governing §102 (pre‑AIA, since filed 1997):

• Inventive/constructive date: 1996‑07‑15 (parent filing; §120 benefit).
• §102(b) critical date: 1995‑07‑15 (one year before parent filing).
• §102(e) window: US filings before 1996‑07‑15.

2. The five references cited on the face of 6,030,074

The authoritative "Citations (5)" list is below. I treat these literally; note the ‘074 specification separately discusses other patents in its background (Section 4).

2.1 US 4,432,005 A — "Ink control system for ink jet printer"

Full citation: US 4,432,005 A; inventors Winey III, Duffield, Cleary; Advanced Color Technology, Inc.; filed 1982‑05‑10; published 1984‑02‑14; IPC G01D15/18 (later B41J2/175).
Description: A pressurized off‑board ink supply for a three‑color ink‑jet printer. Three stationary primary reservoirs formed as long tubular sacks of flexible plastic film sit inside a closed container ("replaceable ink cartridge") kept under continuous pressure, e.g. 3–7 psi, by an air pump. Flexible umbilical tubes carry ink to three small secondary reservoirs mounted on the moving carriage, each with a rigid tub-like bottom covered by a thin flexible dome and an optical level sensor that actuates a solenoid valve to refill the secondary reservoir, then stops flow to prevent over‑pressurization; orifice hydrostatic pressure is held "between 1 and 3 centimeters below atmospheric." A timer flags an out‑of‑ink condition.
§102 assessment:

• It is the strongest §102 candidate for independent claims 1/6/11, because it discloses the supply-side architecture (deformable bag = flexible plastic sack; rigid surrounding container = pressurized cartridge body; supply tube = umbilical tube; pressurizing device = air pump providing continuous positive pressure internal to the container).
• But it does not anticipate claims 1/6/11 as granted: the negative-pressure pressure regulator located in the print cartridge ("detecting a negative ink pressure … more negative than a preset limit … until within a preset negative pressure range") is absent. The Advanced Color unit regulates by optical ink-level sensing in a carriage-mounted secondary reservoir, not by sensing negative pressure in a print cartridge, and its "1–3 cm below atmospheric" figure is a hydrostatic orifice spec, not a regulator trip point. That gap is the anticipated §103 combination point.
• Relevance to dependent claims: it teaches continuous pressurization while printing (maps to claims 2/7) — §103 support, not §102.

2.2 US 4,558,326 A — "Purging system for ink jet recording apparatus"

Full citation: US 4,558,326 A; inventors Kimura and Tanaka; Konishiroku Photo Industry Co., Ltd.; US app. 529,611 filed 1983‑09‑06; JP priorities 1982‑09‑07 et seq.; published 1985‑12‑10; classified B41J2/165 (cleaning/purging).
Description: An on-demand ink‑jet recorder in which "an ink cartridge is a closed‑up rigid body having an opening therein which permits gas to flow in and out," the rigid body "contains a flexible ink container bag which contains recording ink," and "a pressurized gas supply is connected to the ink cartridge body … for increasing the pressure inside the ink cartridge body and for thereby increasing the pressure of the ink in the flexible container bag due to flexing of the bag under increased pressure." An elastic cap couples the cartridge to the head to run ink under pressure during the non‑jet (purging) period. The patent expressly advertises advantages (a) constant pressure regardless of residual ink and (b) "the changeover from the ink supply under normal hydrostatic pressure during the recording period to the ink supply under pressure for the purge during the non‑recording period."
§102 assessment:

• This is the closest reference to the ‘074 disclosure — the bag‑in‑a‑rigid‑container pressurized by gas is essentially the '074 FIG. 1 architecture, and it discloses the "sealable outlet" path (elastic cap to head) that appears in the '074 abstract/description.
• It does not anticipate claims 1/6/11 because (i) it explicitly switches pressurization during the non‑recording period, defeating the "at all times while said printhead is operating" limitation of claim 1 and step of claim 6; and (ii) it has no print‑cartridge pressure regulator that senses negative pressure. The "constant pressure" it claims is during purging.
• Claim-surface mapping: it reads on the supply sub‑combination (bag + rigid container + pressurized gas) that underpins claims 1, 6, 11, and is therefore prime §103 art against those claims, but anticipates none.

2.3 US 4,568,954 A — "Ink cartridge manufacturing method and apparatus"

Full citation: US 4,568,954 A; inventor Martin D. Rosback; Tektronix, Inc.; filed 1984‑12‑06; published 1986‑02‑04.
Description: An ink cartridge for a printer "which supplies pressurized fluid to the cartridge for pressurizing ink within the cartridge to enhance the flow of ink from the cartridge to an ink jet printing head." A collapsible/flexible ink container 16 is heat‑sealed to a support 18, and the assembly is enclosed in a "hollow durable housing" 12 having an ink flow port to the head and a separate fluid flow port. "When pressurized fluid, such as air, is fed through the fluid flow port to the interior of the housing … pressure is applied to the exterior of the ink container. This enhances the flow of ink from the ink container and cartridge." The background expressly discusses the prior "Maco cartridge" (collapsible bag in a plastic housing with an air‑flow passageway applying pressure to the bag).
§102 assessment:

• Discloses the same essential supply triad again (flexible container + rigid housing + external pressurization) plus the sealed ink outlet — strongly material to claims 1/6/11.
• No anticipation: no print‑cartridge pressure regulator, and no teaching of continuous positive pressure "at all times while the printhead is operating." It is §103 art that the Examiner could pair with 2.4 below.

2.4 US 5,650,811 A — "Apparatus for providing ink to a printhead"

Full citation: US 5,650,811 A; inventors Seccombe and Fong; Hewlett‑Packard Company; priority 1993‑05‑21; published 1997‑07‑22 (confirmed by Espacenet cited‑documents record, priority date 1993‑05‑21). §102(e) art only — filed before '074's 1996‑07‑15 priority, published after it.
Description: A print‑cartridge‑mounted pressure regulator: valve + valve seat + spring + diaphragm "that responds to negative pressure developed by the print head and applies an opening force on the valve," with the spring/diaphragm forces sized relative to the maximum ink force in the nozzle, plus anti‑slosh lever features. This is the regulator half of the '074 claim 1 combination and is the same regulator family as the "pressure regulator 41 / −2 inches of water" element of '074 FIGS. 1 and 3.
§102 assessment:

• Anticipates nothing in claims 1/6/11 standing alone: it lacks the deformable bag, the rigid surrounding container, the supply tube, and the externally pressurizing device.
• It is §102(e) prior art and, being HP's own earlier regulator work, is the natural §103 partner to references 2.1–2.3 to render the full claim‑1 combination obvious (pressurized bag supply + negative‑pressure cartridge regulator). No single reference teaches both halves.

2.5 US 5,719,609 A — "Method and apparatus for redundant sealing of a printhead pressure regulator"

Full citation: US 5,719,609 A; Hewlett‑Packard Company; priority/list date 1996‑08‑22; published 1998‑02‑17.
Description: Redundant sealing of the printhead pressure regulator (regulator housing/valve sealing architecture) — again, the regulator side of the '074 combination.
§102 assessment — important caveat:

• On the dates as listed, this reference is NOT available under §102(a), (b), or (e): it post‑dates the '074 priority date (1996‑08‑22 > 1996‑07‑15); its 1996 filing is after applicant's constructive reduction to practice, and its 1998 publication is after both the filing date and the 1995‑07‑15 §102(b) critical date. It is therefore, on its face, not prior art — more likely listed as related/co‑pending HP art or as §103 background.
• The one scenario in which it becomes §102(e) art: if '074's claims were held not entitled to the 1996‑07‑15 parent priority (e.g., if the granted negative‑pressure‑regulator claims lack §112 written‑description support in abandoned parent 08/679,579, whose disclosure is the "sealable ink outlet port" version — see the divergence already flagged in the prior summary). The claims would then take the 1997‑12‑10 filing date, and US 5,719,609 (filed 1996‑08‑22) would be §102(e) art. This is a genuine validity lever worth flagging, not a conclusion.
• I flag that I did not independently confirm whether 1996‑08‑22 is the filing date or an intermediate priority date; the Google listing shows it as the priority date with a 1998 grant, consistent with a 1996 filing.

3. Bottom line on §102

None of the five cited references anticipates any of claims 1–11 as a single reference. The granted independent claims (1, 6, 11) require the concurrence of:

• (i) a print‑cartridge pressure regulator that trips on negative pressure more negative than a preset limit (claims 1/6/11), and
• (ii) a deformable bag inside a rigid container pressurized externally delivering ink "at all times while said printhead is operating" (claims 1/6/11; and the "continuously operating" tie‑in of claims 2/3/7/8).

The five references split along exactly that line:

Accordingly, all five are properly characterized as §103 obviousness art (pressurized off‑board bag supply + negative‑pressure cartridge regulator), with US 4,558,326 being the single most damaging reference against the disclosure and US 4,432,005 the most damaging against the claims' supply side. If the user's objective is a §102‑only attack, the honest answer is that the '074 patent's claims do not appear anticipated by any of its own cited references.

Antecedent/orphan note (does not change the above): claim 11's "said ink," introduced only in the preamble's environment, and the "An pressurized ink supply" typo were flagged in the earlier section; I do not repeat that material here.

4. Secondary art expressly cited in the '074 specification (not on the "Citations (5)" list)

The '074 background identifies four further US patents as the state of the art. These are §102(b)/§103 background art and are not among the five face citations, but a complete prior‑art picture should include them:

• US 4,771,295 (Baker et al.) — ink stored in a permeable foam material reservoir (on‑board, disposable).
• US 5,359,353 (Hunt et al.) — free‑ink type reservoir with a biased ink bladder/bag (on‑board).
• US 4,831,389 — low‑pressure recirculating pumping off‑board ink supply system (identified in search results as Chan, "Off board ink supply system and process for operating an ink jet printer," May 1989).
• US 4,968,998 (Allen) — "Refillable ink jet print system," i.e., a print cartridge refillable at a service station.

These underpin the '074's stated problem (pump‑in‑ink incompatibility; per‑reservoir pressurization cost; reservoir‑size adaptability) and are consistent with the non‑anticipating conclusion above.

5. Provenance, confidence, and open items

• Cited‑reference list (§2): high confidence — the five references are taken verbatim from the authoritative Google Patents "Citations (5)" table for US6030074A; descriptions are grounded in the fetched texts/abstracts of each reference (Google Patents, Espacenet, FPO, Sumobrain as surfaced in search).
• Dates: high confidence for US 4,432,005 (1982‑05‑10/1984‑02‑14), US 4,558,326 (1982‑09‑07/1985‑12‑10), US 4,568,954 (1984‑12‑06/1986‑02‑04), US 5,650,811 (priority 1993‑05‑21/1997‑07‑22 — confirmed by Espacenet cited‑documents record). Moderate confidence for US 5,719,609's 1996‑08‑22 date (single source; not independently re‑verified in this session).
• Not conflated: the ITC campaign reference to US 6,074,042 (a different patent, a continuation sibling) is not US 6,030,074 and is not treated as this patent's reference.
• Open items: (a) I did not pull the actual USPTO file wrapper / Patent Center prosecution history for 08/988,018, which would show the specific §102/§103 rejections and any examiner amendments or affidavits — that is the definitive source for the applicant's own anticipation/obviousness record and for the priority‑support question raised in 2.5. (b) I did not verify US 5,719,609's filing date against Patent Center.

I'll pull details on the five references cited on the '074 front page, plus the sibling family filings, to ground the §103 analysis.

I have the five examiner-cited references. Let me quickly check two "Similar Documents" references that could serve as additional §102(b) art.

Obviousness Analysis — U.S. Patent No. 6,030,074 under 35 U.S.C. § 103

Note on a contradiction in the record: the system prompt for this session states the current date is 2026-09-16, while the task header states April 26, 2026. Per your instruction to flag conflicts rather than silently reconcile them, I am reporting the discrepancy and not correcting either value. It does not affect the substantive analysis (the patent expired 2016-07-15).

Scope note: I was instructed to use the Prior Art section of the page. I ran targeted searches against the five references on the '074 front page and retrieved their disclosures. I attempted two additional lookups on "Similar Documents" candidates (US 5,233,369; US 5,847,734) but hit the tool-call limit before those returned; I therefore treat them as unaudited candidates, not as support, and say so where relevant below.

1. Level of ordinary skill in the art (POSITA)

At the 1996 priority date, a POSITA would be a mechanical or electromechanical engineer with roughly 2–5 years in inkjet printing hardware, or equivalent, familiar with: thermal inkjet print cartridges and their operating-pressure window; back-pressure (negative-pressure) regulation at the pen; "off-axis"/off-board ink delivery for large-format machines; and the design of collapsible ink bags and their fittings. This is the level against which the prior art is read. Notably, the '074 specification itself confirms the sophistication and the known design vocabulary: it recites a two-inch-water preset back pressure, ~2 psi air supply, HDPE ultrasonic welding, FEP septa/conduits, and a "commercially available ball 92 and spring 93" bleed valve — i.e., the inventor characterizes nearly all hardware as commercially available or routine.

2. Prior-art availability gate (this matters more than usual here)

Because '074's application 08/988,018 (filed 1997-12-10) is a continuation of Ser. No. 08/679,579 (filed 1996-07-15, now abandoned), the presumptive effective filing date is 1996-07-15. Pre-AIA § 102/§ 103 governs (application filed 1997). Availability of the five cited references:

Flag on US 5,719,609. If the '074 claims are entitled to the 1996-07-15 parent filing date (which the patent's own § 120 statement asserts), then US 5,719,609 — filed 1996-08-22, issued 1998-02-17 — is not prior art under any subsection of pre-AIA § 102. It would become available only if the '074 claims lack § 112 support in the '579 parent, pushing the effective date to 1997-12-10 (in which case it is § 102(e) art as of 1996-08-22). The examiner nevertheless cited it on the front page. I therefore treat '609 as the closest art on the "continuous positive delivery" limitation but not as a safe primary reference, and I build the primary rejections on '811 + the § 102(b) bag-in-container art.

Flag on common ownership / § 103(c). US 5,650,811 and US 5,719,609 are both HP; '074 is HP. Different inventive entities (Seccombe/Fong; Hauck/Hall vs. Barinaga) satisfy "developed by another person." Under the pre-CREATE Act version of § 103(c) in force when '074 granted (2000-02-29), only § 102(f)/(g) art was disqualified by common ownership — § 102(e) art was not. So '811's § 102(e) status survives. (Had '074 granted after 2004-12-10, the CREATE-Act-expanded § 103(c) would arguably disqualify '811 as commonly owned § 102(e) art. That timing point is worth confirming against the statute as of the grant date.)

Family members are not prior art. US 6,290,343, US 6,874,872, US 6,074,042 and US 6,206,512 share the 1996-07-15 priority and/or are HP-family continuations/counterparts; they cannot be used against '074. In particular, do not conflate US 6,074,042 (asserted in ITC Inv. 337-TA-581) with this patent — different number, different document, per the standing instruction to read identifiers literally.

3. Claim construction points that drive the analysis

1. "at all times while said printhead is operating" (claims 1, 6, 11). This is the only limitation that meaningfully separates the claims from the 1980s bag-in-a-box art. It is a timing/control limitation, not a structural one.
2. "a rigid container substantially surrounding said ink bag" + "providing said positive pressure internal to said rigid container". This is the classic bag-in-a-rigid-vessel architecture, and the 1983–1986 references disclose it squarely.
3. "a pressure regulator … detecting a negative ink pressure … more negative than a preset limit". A back-pressure regulator on the pen converting a positive supply pressure to the pen's negative operating pressure.
4. The "sealable ink outlet port" is NOT claimed. As noted in the earlier summary, the abstract and description center on a sealable outlet port and quick-disconnect valves (43, 67), but no claim recites them. All of that disclosure — and any prior art on quick-disconnects and septa — is irrelevant to claim scope. Correspondingly, the '074 claims read more broadly than its abstract suggests.

4. Element-by-element gap analysis

4.1 The bag-in-rigid-container, gas-pressurized supply (claims 1/6/11, elements (b), (c), (d), (f))

US 4,558,326 is the single most damaging reference and was known to the examiner. Its claim 2 recites, verbatim in substance:

• "an ink cartridge … comprised of an ink container bag filled with said recording ink and an ink cartridge body which houses said ink container bag, said ink container bag having at least a flexible portion";
• "said ink cartridge body being a closed-up, substantially rigid body having at least one opening therein for permitting gas to selectively flow in and out";
• "a pressurizing gas supply means which selectively supplies gas under pressure to said at least one opening … for increasing the pressure inside said ink cartridge body … thereby increasing the pressure around the outside of said ink container bag and thereby increasing the pressure of the ink inside said ink container bag due to flexing under said increased pressure";
• "a cap … coupled to said ink container bag in a liquid tight manner for supplying said recording ink from inside said ink container bag into said recording head."

Its claim 3 recites that the pressurizing gas supply means "comprises an air pump"; claim 5 adds an air pump with a control valve governing conduction and exhaust; claim 2 adds "means for selectively venting said at least one opening." The specification adds the articulated advantages that map directly onto the '074 rationale: "capable of forcibly running ink under always constant pressure regardless of the residual quantity of the ink in the ink container"; "Uniform pressure is applied to the ink in the ink cartridge"; "No partially excessive force is applied to the ink container, so that the ink container is by no means ruptured"; and, pointedly for motivation, that the prior approach using "a pressure pump … requires an expensive pump for liquid use, so that it becomes a problem in respect of cost."

US 4,568,954 discloses the same architecture in a different vocabulary, and adds the very "ink input" interface the claims recite: a "rigid, hollow housing 12 within which an ink container assembly is positioned," a "collapsible ink container," a "fluid flow port communicating with the interior of the housing and exteriorly of the ink container, whereby upon supplying pressurized fluid through the fluid flow port to the interior of the housing, pressure is applied to the exterior of the ink container to enhance the flow of ink through the ink flow opening and ink flow port," plus "valve means in the ink flow passageway" and a hollow air supply needle and puncturable seals (the latter not claimed in '074 but showing the needle/septum concept later used in '074's FIG. 3 alternative embodiment).

US 4,432,005 adds the system-level teaching: three "long tubular sacks of flexible plastic film, contained in a pressurized disposable cartridge," where "the compartment 16 is maintained under constant pressure, for example between 3 and 7 pounds per square inch, by an air pump 22," with the sacks connected "through flexible plastic umbilical tubes" to carriage-mounted reservoirs. Its stated objective of keeping "the hydrostatic pressure at the orifices … between 1 and 3 centimeters below atmospheric" is the same negative-pressure objective the '074 claims assign to the pressure regulator.

Net: elements (b), (d), (f) and the "positive pressure internal to the rigid container" portion of (g) are fully disclosed in the § 102(b) art. The '074 range of ~2 psi sits inside or immediately adjacent to '005's disclosed 3–7 psi and inside '609's disclosed +30 in. water to 3 psi supply range; overlapping/subsumed pressure ranges are obvious per In re Peterson/In re Woodruff, particularly where, as here, the specification concedes the operable range is "from minus 10″ of water to over 45 psi."

4.2 The print cartridge with negative-pressure regulator (claims 1/6/11, elements (a), (b))

US 5,650,811 discloses a printhead and an on-pen regulator for the stated purpose of "the delivery of ink and the control of ink pressures in ink-jet printheads." Its claim 14 recites "a print head for ejecting droplets of ink on command on to a printing medium"; "a pressure regulator for receiving ink from an ink reservoir and for delivering ink to the print head, said pressure regulator being in fluid communication with the print head"; and "a valve and a valve seat within the pressure regulator … [that] regulate the pressure of the ink delivered to the print head." Claim 15 recites "a diaphragm within the pressure regulator that responds to negative pressure developed by the print head and applies an opening force on the valve" — i.e., precisely the "detecting a negative ink pressure, relative to atmospheric pressure … more negative than a preset limit" function of claim 1. Claim 11 adds a nozzle sized to accommodate the maximum (blackout) print flow rate, showing the reference is directed to full-rate printing, not just purge.

US 5,719,609 (with the availability caveat above) is even closer on the system framing: it expressly recites the combination of "a print head having an operating pressure of less than atmospheric pressure, a source of ink having a supply pressure of greater than the print head operating pressure, and a back pressure regulator for reducing the supply pressure of the ink down to the print head operating pressure," with operating pressures of "about −2″ (minus two inches) of water to about −10″ (minus ten inches) of water" and supply pressures of "+30″ … to about 3 psi." It also discloses that "ink is supplied through the hollow needle 30 to the intermediate chamber 40 continually at the supply pressure" during the printing cycle.

4.3 The residual gap: "at all times while said printhead is operating"

US 4,558,326 vents its cartridge to atmosphere to stop purging (claim 2) and frames its pressurization as occurring "during a non-recording period … to purge the recording head." That is the one place a POSITA would perceive a difference from claim 1's "at all times while said printhead is operating." Three independent answers dispose of it:

1. A regulation reference supplies it. US 4,432,005's compartment is "maintained under constant pressure … by an air pump 22" — continuously, not on a purge-only basis. US 5,719,609 (if available) states ink is delivered to the pen "continually at the supply pressure" during printing. Either supplies continuous positive-pressure delivery to the pen.
2. It is a control-scheme choice, not a structural one. Once a back-pressure regulator on the pen (per '811/'609) holds the pen at −2 in. water, keeping the bulk supply pressurized during printing is the simplest scheme and the one most consistent with the purpose of pressurizing at all; cycling the compressor off during printing would defeat delivery. Obvious to try per KSR Int'l Co. v. Teleflex Inc., 550 U.S. 398 (2007).
3. The reason '326 vented during recording does not counsel against the combination. '326's vent was to prevent an unwanted purge flow when no regulator was present. In the '811-based system, the regulator absorbs the pressure differential and prevents drooling; the '326 rationale is therefore inapplicable, not contrary. This is the standard rebuttal to a teaching-away argument.

4.4 Dependent claims

4.5 Claim 11 (article claim including the printer environment)

Claim 11 recites the same four supply-side elements as claim 1 with the print cartridge/regulator as environmental context. Under KSR and In re Kollman, reciting structure as environmental does not impart patentability where the supply-side elements are separately disclosed. Separately flag (not a § 103 issue): claim 11 recites "a deformable ink bag containing said ink," but "ink" appears only in the preamble's environment; there is no antecedent element. Together with the typographical "An pressurized ink supply," this is a § 112(b) antecedent-basis defect to note in any validity assessment, but it does not create a § 103 gap.

5. The combinations, with motivation

Combination I (primary): US 5,650,811 + US 4,558,326 + US 4,432,005

Read '811 for the print cartridge and its negative-pressure-responsive regulator; read '326 for the deformable bag in a rigid, gas-pressurized body; read '005 for continuous constant pressure from a single air pump feeding multiple ink sacks. Every element of claims 1, 2, 4, 5, 6, 7, 9, 10 and 11 is accounted for; claims 3/8 add a conventional vent or '326's own vent/control valve.

Motivation, articulated (KSR factors A, B, C):

• (A) Known elements, known methods, predictable result. Each element does what it was known to do: a bag transmits externally applied gas pressure to ink; a tube conveys pressurized ink; a regulator converts positive supply pressure to the pen's negative operating pressure. No element changes its function in the combination; the result (ink delivered at positive pressure to a regulated pen) is the expected result.
• (B) Explicit suggestion in the art to substitute an air-pressurized reservoir. US 5,719,609 states that "the pressurized ink supply 12 can take many forms including a spring actuated diaphragm, an air pressurized reservoir, and a gravity driven supply." That is an express pointer to the '326/'005 bag-in-container architecture as a design option for the very system the claims recite. Even a POSITA who had only '811 would find this design option squarely in the field.
• (C) The art states the improvement the combination achieves, and states it for the same reason. '326's own objects include "capable of forcibly running ink under always constant pressure regardless of the residual quantity of the ink in the ink container" and "Uniform pressure is applied to the ink in the ink cartridge … so that the ink container is by no means ruptured." That is exactly the function claim 1 assigns to the pressurizing device.
• Additional, independent motivation from the '074 background itself (applicant's admission). The '074 specification states: "Pumps can be used for such delivery, but such pumps have problems associated with their use. For example, the ingredients in the ink can be incompatible with the pump components, and such components as diaphragms and seals can degrade when exposed to the ink solvents for extended time periods." An air-pressurized bag-in-a-box removes the pump from the ink path entirely — the pump touches only air. This is the classic "the prior art identifies the problem and the combination solves it" showing. The same background passage also supplies the "one pump for all reservoirs" motivation: "it would be desirable to use one pump that can provide the necessary pressure for all the ink reservoirs individually." US 4,432,005 does exactly that — "one air pump 22" pressurizing a compartment containing three sacks; and the '074 spec itself contemplates an air manifold 61 with four gas outlet ports for black/magenta/cyan/yellow.
• Cost/design incentive. '326 expressly criticizes the alternative ("requires an expensive pump for liquid use … a problem in respect of cost"), and '005 achieves one pump for three colors — a direct cost and complexity incentive, matching '074's own stated cost concern about "the addition of each additional pump."

Combination II (alternative): US 5,650,811 + US 4,568,954 + US 4,432,005

Substitute (or add) '954 for '326. '954 contributes the rigid hollow housing with a dedicated fluid flow port into the housing exterior of the collapsible container, the ink flow port/flow opening pair, and valve means in the ink flow passageway — i.e., it maps almost one-for-one onto '074's claimed "rigid container substantially surrounding said ink bag," "ink supply tube connected between said ink bag and said ink input," and the fluid port/air interface. Motivation is the same as Combination I, reinforced by '954's express statement that the pressurized-fluid arrangement "enhance[s] the flow of ink through the ink flow opening and ink flow port," and by '954's own use of a puncturable gasket and air supply needle — structurally the same interface as '074's FIG. 3 septum (112)/hollow needle (128) alternative embodiment.

Combination III (aggressive): US 5,719,609 + US 4,558,326 (or US 4,568,954)

If '609 is available as prior art (see the filing-date caveat in § 2), it is the closest single reference: it recites the print cartridge/back-pressure regulator with −2 in. water operating pressure and positive supply pressure, an ink reservoir containing a metalized film bag, a pump, an ink delivery conduit with a fluid interconnect, and continuous supply pressure during printing. It supplies the "at all times while said printhead is operating" limitation directly. Combined with '326's rigid-body gas pressurization of a flexible bag, claims 1–5 and 6–10 fall out with essentially no gap. This is the combination I would most want to run in a reexam, precisely because it closes the only real gap — but it depends on the priority-date question, so it should be pleaded in the alternative.

Secondary-reference note (unaudited)

The page's "Similar Documents" list includes candidates that may independently corroborate the regulator and pressurization teachings, e.g., US 5,233,369 (1993-08-03, "Method and apparatus for supplying ink to an ink jet printer"), US 5,847,734 (1995-12-04 filing, "Air purge system for an ink-jet printer"), and EP 0 508 125 B1 (1996-06-26, "Ink delivery system for ink jet printers"). I did not read these in this session and therefore do not rely on them; they are flagged as the next references to pull if Combination III is unavailable because of the '609 date issue.

6. Anticipated counter-arguments and rebuttals

7. Conclusions

1. Claims 1, 6 and 11 are prima facie obvious over US 5,650,811 in view of US 4,558,326 and US 4,432,005, and alternatively over US 5,650,811 in view of US 4,568,954 and US 4,432,005. Every structural element is disclosed; the only limitation without a direct match in the § 102(b) art is the continuous-during-printing timing of pressurization, which is met by '005's constant-pressure compartment and, in any event, is a predictable control-scheme choice under KSR.
2. Claims 2–5 and 7–10 are obvious over the same combinations: continuous operation and pump operation come from '326 claim 3 / '005 / '609; the bleed valve comes from '326's vent/control-valve teachings and is conceded by the specification to be "commercially available"; droplet-expelling printheads are in '811 and '005.
3. If US 5,719,609 is available as prior art (i.e., if the '074 claims are not entitled to the 1996-07-15 parent date), the rejection becomes materially stronger and the "at all times while operating" gap closes without resort to an obviousness-of-timing argument. Resolving '074's effective filing date is the single highest-value step in this analysis.
4. The strongest § 103 theme is the applicant's own admissions. The '074 background describes the problem (pump/ink incompatibility degrading diaphragms and seals), the desired solution (one pump serving multiple reservoirs), and the commercial motivation (cost of multiple pumps). The § 102(b) art discloses precisely that solution for the same reasons. That alignment of problem, solution and rationale across the same field is the core of the case.
5. Two non-§ 103 items worth carrying forward: (i) claim 11's missing antecedent for "said ink" (plus the "An pressurized" typo) is a § 112(b) issue; and (ii) the abstract/description's emphasis on a "sealable ink outlet port" that no claim recites means the quick-disconnect and septa art (FIGS. 2A, 2B, 3) is beside the point for infringement and for § 103 — a scope divergence already flagged in the earlier summary and confirmed here.

Confidence: High on the disclosures and claim language of all five cited references (I read their claims and specifications directly, via their verbatim claim text and abstract). High on the § 102(b) status of US 4,432,005, US 4,558,326 and US 4,568,954. Moderate on the US 5,719,609 availability analysis, because it turns on whether the '074 claims find § 112 support in the abandoned parent — a determination that requires the file history (Ser. No. 08/679,579 and the '074 prosecution record), which I could not retrieve here. Unverified: the "Similar Documents" candidates (US 5,233,369; US 5,847,734; EP 0 508 125 B1) — flagged, not relied upon.

Sources: https://patents.google.com/patent/[US6030074](/patent/US6030074)/en · US 5,650,811 (freepatentsonline.com/5650811.html) · US 5,719,609 (patentimages.storage.googleapis.com PDF; uspto.report/patent/grant/5719609) · US 4,432,005 (uspto.report/patent/grant/4432005) · US 4,558,326 (patentimages.storage.googleapis.com PDF; sumobrain.com/patents/us/Purging-system-ink-jet-recording/4558326.html) · US 4,568,954 (sumobrain.com/patents/us/Ink-cartridge-manufacturing-method-apparatus/4568954.html; uspto.report/patent/grant/4568954)