US 10845348

I'll search for authoritative information on this patent, including any 2026 litigation activity.

Let me run a couple more targeted searches to confirm litigation status and docket activity.

US 10,845,348 B2 — Summary Report

Search note / scope limitation: I ran open web searches (Google Patents, FreePatentsOnline, PubChem patent records, Patent Leaderboard, and Federal Circuit summary/litigation aggregators). I do not have live, credentialed access to USPTO PatentCenter/PAIR or to the CAFC docket system (PACER/CM-ECF), so my docket findings below reflect what is publicly indexed rather than an official docket query. I flag this explicitly rather than assert certainty.

I also treated the patent number literally as 10,845,348 (US10845348B2) and did not substitute any similar number. Results for unrelated patents (e.g., 10,225,588; 10,912,321; 10,828,345; 11,806,348) appeared in searches but are not this patent and are excluded.

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1. Bibliographic data (from the authoritative full text)

Note: "Active / expires 2037-09-14" is Google Patents' stated legal-status estimate, not an official legal conclusion.

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2. Abstract (verbatim)

"A gas sensor includes: a cell array which includes a plurality of cells disposed in rows and columns; a read-out circuit which reads out signals from the plurality of cells; and a signal processor which processes the signals read out. Each of the plurality of cells includes: a gas molecule detector which is electrically isolated between adjacent ones of the plurality of cells; and an amplifier circuit which is electrically connected to the gas molecule detector."

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3. Plain-language overview of the independent claims

There are two independent claims: claim 1 (apparatus) and claim 17 (system). All other claims (2–16) depend, directly or indirectly, from claim 1.

Independent Claim 1 — Gas sensor. A gas sensor made of four cooperating parts:

1. a cell array of cells arranged in rows and columns;
2. a read-out circuit that reads signals out of those cells;
3. a signal processor that processes the read-out signals; and
4. a first control circuit.

Each cell contains (a) a gas molecule detector that is electrically isolated from the detector of the neighboring cell, and (b) an amplifier circuit wired to that detector. Crucially, the cell array is divided into a first region containing at least one cell and a second region containing the remaining cells, and the first control circuit applies potentials of opposite polarity between the detector(s) in the first region and the detectors in the second region. In plain terms: some detectors are biased positive while others are biased negative, so charged target gas molecules are Coulomb-attracted to the detection region and unwanted charged molecules are drawn away to the other region.

Independent Claim 17 — Gas sensing system. A system comprising (i) the gas sensor of claim 1 and (ii) a rectifier that generates a laminar flow, where the rectifier introduces gas molecules into the gas sensor. The specification describes this as enabling transport of distant target gas to the sensor without disturbing the gas's spatial distribution (Reynolds number ≤ 2000, per the description).

Key point of differentiation from the specification's broad "aspect": the abstract and the summary-of-disclosure describe only the cell-array/read-out/signal-processor combination. The granted claim 1 adds the "first control circuit" and the first-region/second-region opposite-polarity limitation, which is the narrowing feature that recites in the issued independent claim.

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4. Docket / litigation status (CAFC 2026 and district courts)

• Federal Circuit (CAFC) 2026: I found no 2026 CAFC appeal, opinion, petition, or docket entry involving U.S. Patent 10,845,348 in the indexed Federal Circuit materials (including weekly Federal Circuit summaries for 2026 and 2026 rehearing/petition filings).
• District court litigation: No indexed infringement complaint, IPR, or district court docket naming US 10,845,348 surfaced in searches. Google Patents shows only forward citations (six family-citing publications, including KR102227957B1, CN110252079B, WO2021100790A1, JP2023099245A, JP2023153659A, WO2025070109A1) and backward citations (12), plus one non-patent citation (the PCT International Search Report dated 2017-03-21). It shows no "litigation" entries and no "cited by examiner" litigation flags.
• Uncertainty statement: My inability to find a docket is not proof that none exists. Litigation may be pending that is not captured by the open sources I can access (e.g., a recently filed complaint, a sealed case, or an ITC proceeding). If a definitive docket check is required, it should be run directly in PACER/CM-ECF (Federal Circuit and district courts) and USPTO PatentCenter/PTAB.

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5. Points of uncertainty / caveats

1. Docket confirmation is incomplete — as noted, I relied on indexed web sources, not official PACER/USPTO databases.
2. Legal status ("Active," "expires 2037-09-14") is a third-party (Google Patents) estimate and expressly disclaimed as a legal conclusion by its own terms.
3. The patent text I was given was fetched 2026‑09‑24; if a 2026 CAFC matter arose after that fetch, my source text would not reflect it.
4. I did not find any evidence of reexamination, reissue, or PTAB post-grant review of this patent in the indexed materials.

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6. Sources consulted

• Full patent text (authoritative): https://patents.google.com/patent/US10845348/en
• FreePatentsOnline pre-grant publication: https://www.freepatentsonline.com/y2018/0292347.html
• PubChem patent record for the Chinese family member CN-108369200-A: https://pubchem.ncbi.nlm.nih.gov/patent/CN-108369200-A
• Patent Leaderboard (inventor/assignee listing): https://www.patentleaderboard.com/panasonic/toru-okino/[310741](/patent/310741)
• Federal Circuit weekly summaries (2026) via Patterson Sheridan publications (used to check for any CAFC activity; none matched this patent)

If you want, I can next (a) pull the exact per-claim text for dependent claims 2–16, or (b) map claim 1's "opposite-polarity region" feature against the cited prior art (JP H59-142452, JP 2012-112651, JP 2004-085392, and the Life Technologies two-transistor/charge-accumulation references) to assess novelty/obviousness pressure points.

I'll search for litigation involving US patent 10845348 specifically.

Let me search more targeted sources for this specific patent.

Let me check the Unified Patents litigation portal and related docket sources directly.

Summary of Findings: Litigation Involving US Patent 10,845,348

I did not find any record of litigation involving US Patent 10,845,348 (B2).

What I searched

I ran targeted searches against patent-litigation and docket-oriented sources (Unified Patents litigation resources, CourtListener, PTAB/PTACTS records, and general web/patent aggregators), using the exact number 10845348 and the patent's title ("Gas sensor and gas sensing system") and assignee (Panasonic Intellectual Property Management Co., Ltd.). Every hit that matched the numeric string was either an unrelated document (e.g., an EP application number, "EP 10845348.1," for an unrelated aircraft invention) or a patent-profile page (e.g., a Patent Leaderboard entry listing US 10,845,348 as one of inventor Toru Okino's patents). None reflected a filed lawsuit, ITC action, or PTAB proceeding asserting or challenging this patent.

What the public record does show for this patent

From the authoritative patent text you provided, the patent's lifecycle shows no litigation activity, only prosecution and maintenance:

The Google Patents page lists only "Families Citing this family," "Citations," and "Family Cites Families" — i.e., forward/backward patent citations. There is no "Litigation" or "Related Litigation" section, and no assignment data indicating transfer to a litigious third party (the patent remains with Panasonic Intellectual Property Management Co., Ltd.).

Important caveats (per your instructions on not fabricating)

• A negative search result is not proof that no litigation exists. Public docket aggregators can be incomplete, lag in coverage, or miss sealed/settled cases; and any NPE assignment just before a complaint would not yet be reflected.
• I did not obtain a direct positive query result from a live litigation database (e.g., a Unified Patents caselist, Docket Navigator, or PACER) confirming a case for this exact number; my searches returned no such match, and the numeric ID produced only false-positive collisions (notably the unrelated "EP 10845348.1").
• To reach a definitive conclusion, the authoritative check would be a direct lookup of 10845348 in PACER/CM-ECF and the Unified Patents litigation portal caselist, plus the PTAB/PTACTS proceeding search and the USITC EDIS docket. I was unable to complete that final confirming step within my available search budget.

Bottom line: Based on the sources consulted, there is no known litigation involving US Patent 10,845,348. If you need a legally defensible negative clearance, I recommend confirming via PACER and the Unified Patents caselist for the identifier 10845348 directly.

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

Proceedings overview

No AIA trial proceedings are on file for US 10,845,348. The structured USPTO Open Data Portal block returns a count of zero — no IPR, PGR, or CBM petitions, no institution decisions, no Final Written Decisions, no settlements, and no Federal Circuit appeals arising from a PTAB trial. I also ran independent web searches (patent number in combination with IPR/PGR identifiers, petitioner-side terms, and Panasonic gas-sensor assertion activity) and found no petition, Board decision, or appeal that I can attribute to this patent; per the verification rule, I am reporting the absence rather than guessing at proceedings. Note the one caveat the operating instructions flag: ODP ingest lag. Any petition filed in the last few months could be unindexed, so treat "zero" as "no activity on record as of 2026-09-29," not as a metaphysical certainty.

The defensive posture this yields is the opposite of the comforting version. This is not a patent "hardened by surviving IPRs" — it is a patent that has never been tested at the Board at all. All 17 claims (independent claims 1 and 17, plus claims 2–16) are UNTESTED. Claim 1 has never been construed by a panel, no prior-art ground has been publicly vetted against it, and there is no estoppel of any kind binding anyone. For a defendant, that cuts both ways: nothing is canceled, but nothing is validated either, and the Board has never told you which of these claim limitations is the weak link. The patent is, as of today, a blank slate.

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Proceedings overview (per-proceeding detail)

There are no proceedings to detail. No ### {PROCEEDING_NUMBER} entries are fabricated below, because none exist in the structured data.

For completeness, here is what a defendant should confirm independently before relying on the zero-count:

• USPTO PTAB E2E / PTAB Decisions portal — search by patent number 10,845,348 and by application number 16/005,995. A petition is typically served and docketed within days of filing even before institution, so a genuinely zero result is meaningful.
• USPTO Patent Trial and Appeal Board "Patent Trial Proceedings" search and the ODP API /proceedings endpoint referenced in the source block.
• CourtListener RECAP / Docket Alarm — no AIA trial means no CAFC appeal from a Board decision, but check separately for district-court litigation involving this patent, which is the usual precursor to a petition.

One structural point worth flagging: this patent is the US member of a four-jurisdiction family — JP 6548178B2, CN 108369200B, WO 2017104130A1, and the US case. Foreign counterpart invalidation (e.g., a CNIPA invalidation action against CN 108369200B, or a JP opposition/invalidation trial against JP 6548178B2) would not appear in the PTAB block but is highly relevant prior-art intelligence. I found no such action in my searches either — but that is a jurisdiction I did not search exhaustively, and I'd flag it as unverified rather than negative.

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Strategic summary

Claim status: everything is UNTESTED. No claim of US 10,845,348 has been canceled, confirmed, or even instituted upon. Independent claim 1 recites the core combination — cell array in rows and columns, read-out circuit, signal processor, a first control circuit, per-cell gas molecule detectors "electrically isolated between adjacent ones," an amplifier circuit, a first region / second region split, and the first control circuit applying potentials having mutually different polarities between the first-region detector and the second-region detectors. Independent claim 17 is the system claim (gas sensor + rectifier generating a laminar flow). Claims 2–16 are dependent, layering on the charge-accumulation-area-plus-reset-transistor architecture (claim 2), the transfer-transistor switch (claims 4–5), per-column and per-cell reset potential control (claims 6–9), the feedback amplifier circuit (claim 10), the sequential polarity-change-from-periphery claim (claim 11), the upper electrode / hollow region (claim 12) and surrounding peripheral electrode (claims 13–14), and the adsorbent / catalyst variants (claims 15–16). Because no panel has construed any of this, the scope of "electrically isolated," "first control circuit," and "hollow" is entirely open.

Estoppel landscape: there is none. § 315(e)(2) estoppel only attaches to a petitioner who obtains a Final Written Decision. With no FWD in existence, no party is estopped from anything, and equally, no prior art has been publicly tested and cleared. For a defendant being asserted against today, every prior-art ground remains available — including grounds that would be time-barred or § 325(d)-risky if someone had already run them through the Board. The practical corollary: you are the first mover, which means you can shape the record, but you also carry the full cost and risk of being first (including the possibility that the Board construes a limitation narrowly against you and hardens the patent for the next defendant).

Pattern signals: no patterns exist yet. No petitioner has filed multiple IPRs on this patent — no petitioner has filed even one. There is no indication of a defensive aggregator (Unified Patents, RPX, et al.) in the chain; Unified in particular tends to target high-assertion-volume patents, and this patent shows no assertion footprint at all. The patent owner, Panasonic Intellectual Property Management Co., Ltd., is a sophisticated, large-entity portfolio holder that litigates actively in other technology areas — I found Panasonic asserting unrelated patents against Broadcom and Magna in W.D. Tex., and being a defendant in numerous NPE suits — so the absence of PTAB activity here is not a sign of a passive owner. It is more consistent with a patent that has not yet been commercialized into an assertion campaign, or whose assertion targets have chosen to license or settle rather than petition. The patent's own prosecution history is unremarkable: filed 2018-06-12 as a § 371/continuation of PCT/JP2016/005115, one non-final action 2020-06-11, allowance 2020-09-10, granted 2020-11-24, 4th-year maintenance fee paid 2024-04-23 — a clean, unchallenged grant.

The absence is itself the signal. A patent that is being actively asserted against deep-pocketed, IPR-savvy defendants reliably attracts petitions; the Board's docket is full of them. Zero proceedings here means either (a) the patent has not been asserted against anyone who considered an IPR worth the filing fee, or (b) assertions have resolved quietly. Either way, a defendant receiving a demand letter citing this patent is likely dealing with a first assertion, and should assume the plaintiff has not yet had its claims stress-tested.

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Recommended next steps

1. Do not build a defense on IPR outcomes that don't exist. There is no FWD to link to and no canceled claim to quote. Any statement that claims 1–5 (or any other claims) have been invalidated would be false — all 17 claims stand as issued and untested.
2. Confirm the zero-count yourself before drafting anything. Pull the PTAB E2E docket for US 10,845,348 / App. 16/005,995 and the ODP proceedings endpoint, and re-check within 30–60 days of your filing deadline. If a petition is filed in the interim, it will appear before institution and you will want to track the statutory clock: institution decision due within 6 months of the petition's filing date (§ 314(b)), and if instituted, the FWD is due within 1 year of institution (§ 316(a)(11)), extendable by up to 6 months for good cause.
3. Run a fresh prior-art search with an eye to § 102/§ 103 on claim 1's polarity-control limitation. No one has done this publicly. The most promising attack surface is likely claim 1's relatively narrow requirement that the first control circuit apply mutually different-polarity potentials across a first and second region of the cell array — that is a specific, structurally limiting recitation that a bare image-sensor-plus-gas-detector reference may not teach. Claim 2 (charge accumulation area + reset transistor + amplification transistor) is the broadest, most conventional-sounding combination and may be the softer target, but note that it is dependent and narrower in combination with claim 1.
4. Mine the cited art. The patent's own IDS (17 references) is a ready-made starting kit: US 2012/0000237 and US 2012/0000274 (Life Technologies, two-transistor pixel array / ion-sensing charge-accumulation circuits), JP 2012-112651 (Sharp, chemical substance detector), JP 59-142452 (NEC, ion sensor), JP 2004-085392 (Fujitsu, FET chemical sensor with carbon linear structure), and US 6,187,597 (Nordic Sensor Technologies) are all directly on point for the charge-accumulation architecture. The applicant distinguished these on the "no temperature controller needed / miniaturization" rationale, which is an argument about advantage, not about patentable distinction — a fertile § 103 line.
5. Check the foreign counterparts. A search of CNIPA (CN 108369200B) and JPO (JP 6548178B2) invalidation/opposition records may yield art that was never before the US examiner. This is the highest-value unchecked box in this file.
6. Preserve the § 315(b) clock. If you have been served with a complaint asserting this patent, the one-year bar date under § 315(b) runs from service, and any real-party-in-interest or privity relationship with an earlier-served party can pull your deadline backwards. Calendar it now — with no existing petitioner, you cannot rely on someone else's petition to carry the load.

Bottom line: there is nothing to report because nothing has happened. The patent is entirely intact and entirely untested. That is a green field for a first petitioner and zero free information for a defendant looking for a shortcut.

I'll verify the assignment record against the USPTO Assignment Center and related sources before writing the analysis.

Let me dig further into the specific assignment record and any litigation involving this patent.

Research note on sources

I was able to retrieve the patent's own record and the Google Patents legal-events block (the authoritative assignment data in the materials provided), plus corroborating family/status data. I was not able to open a live Assignment Center record in this session; the search results returned did not surface an Assignment Center or assignment.uspto.gov detail page for US 10845348. Findings below are grounded in the records I could actually read, and I flag explicitly where a field (notably correspondent) is not exposed in those records rather than inferring it.

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Inventors

Pattern check — no anomalous departures. All four inventors executed the same assignment (reel 046808/0751, effective 2018-05-09) transferring their rights to Panasonic Intellectual Property Management Co., Ltd. That is the ordinary national-stage formality for a Japanese-origin PCT case, not a pre-fire-sale inventor exodus. The execution date (May 2018) sits immediately before the US continuation filing date (2018-06-12) — the classic "assign-to-affiliate-before-US-filing" step. No evidence anyone left the assignee within 12 months of filing.

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Original assignee

Panasonic Intellectual Property Management Co., Ltd. (Osaka, Japan) — the IP-holding/management subsidiary of Panasonic Corporation (now Panasonic Holdings Corporation). Listed on the face of the patent as both original assignee and current assignee.

• Product embodiment: Yes, at the corporate-group level. Panasonic is a long-standing manufacturer of gas sensors and gas-sensing modules; this disclosure is directed to a manufacturable CMOS-compatible cell-array gas sensor (claims recite a cell array, read-out circuit, signal processor, and a first control circuit). The specification expressly frames the device as a small, low-cost, mass-producible alternative to heater-based sensors, and describes fabrication via "a common manufacturing method of an image sensor," which is consistent with a real product line rather than a paper patent.
• Primary line of business: Consumer and industrial electronics; the patent classifies into G01N27/414 (ISFET/CHEMFET) and G01N33/00 (gas analysis), matching Panasonic's sensor business.
• Current status: Operating. No bankruptcy, dissolution, or divestiture signals in the record. Maintenance fee for the 4th year was paid 2024-04-23 by the large-entity owner (USPTO legal events, code MAFP) — an affirmative act of ownership retention.

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Assignment timeline

The record I can verify contains exactly one recorded assignment in the US chain.

• 2018-05-09 (executed) / recorded 2018-09-06 — Reel 046808/0751
  • Conveyance: Assignment — recorded as "ASSIGNMENT OF ASSIGNORS' INTEREST (SEE DOCUMENT FOR DETAILS)"
  • Assignor: OKINO, TORU; HIROSE, YUTAKA; KATO, YOSHIHISA; OKI, AKIO (all four named inventors)
  • Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD. (Japan)
  • Correspondent: Not exposed in the records available to me. The Google Patents legal-event entry for reel 046808/0751 lists assignors, assignee, reel/frame, and effective date, but no correspondent/attorney field, and I could not open the underlying USPTO recording in this session. I am not going to invent a name or firm here. For prosecution correspondence in the same family, the only attorney data surfaced was for an unrelated Panasonic application (Customer No. 125331, Greenblum & Bernstein, P.L.C., Reston VA, filer James Paul Bonnamy) — that is a different application (15/656,426) and must not be attributed to this patent.
  • Context: Ordinary employer/affiliate vesting of inventor rights on the eve of US national-stage entry — not a fire-sale, securitization, or transfer-to-asserter.

No further assignments are recorded. There is no second link, no LLC, no security agreement, no license record, and no defensive-aggregator transfer. Notably:

• The patent family shows the same ownership across jurisdictions: JP6548178B2, CN108369200B, and WO2017104130A1 are all Panasonic-held; there is no family member sitting with a different (NPE-suggestive) owner.
• No litigation naming US 10845348 surfaced in searching. The gas-sensor litigation hits I found (e.g., Advanced Engineering Services LLC v. LumaSense Technologies, N.D. Cal.) involve different parties and different patents and do not name this patent.
• The six citing publications are all operating entities or universities (LG, Tianjin University, JAIST, Sharp, Shinto Kogyo, Panasonic) — no asserter has acquired the portfolio.

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Timeline diagram

timeline
    title Ownership of US 10845348
    2015 : JP priority application filed
    2016 : PCT application filed by Panasonic
    2018 : US continuation filed
         : Inventors assign rights to Panasonic IP Mgmt
    2020 : Patent issued to Panasonic IP Mgmt
    2024 : Maintenance fee paid by Panasonic

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NPE / troll-pattern signals

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Verdict

Insufficient data (only the original assignment).

The record for US 10845348 contains a single recorded assignment — inventors Okino, Hirose, Kato, and Oki to Panasonic Intellectual Property Management Co., Ltd., executed 2018-05-09 and recorded 2018-09-06 at reel 046808/0751 — which is the routine vesting step for a Japanese-origin PCT national-stage entry, not an NPE transaction. Every downstream indicator points to continued operating-company ownership: the patent is Active with a 2037-09-14 adjusted expiration, the 4th-year maintenance fee was paid 2024-04-23 by the large-entity owner, all family members (JP6548178B2, CN108369200B, WO2017104130A1) remain with Panasonic, and no litigation or asserter acquisition was found. There is therefore no NPE chain to characterize — but equally, no defensively-aggregated end state, so the honest call under the given taxonomy is insufficient data rather than "defensive."

Caveats for a human reviewer: (1) the correspondent of record for reel 046808/0751 was not retrievable here and should be pulled directly from Assignment Center to close signal #3; (2) state law does not require recording, so an unrecorded transfer of this patent could exist without appearing in the database — I found no evidence of one, but absence of a record is not proof of absence of a deal. Verify at the USPTO Assignment Center: https://assignmentcenter.uspto.gov/ and the legacy interface at https://assignment.uspto.gov/patent/index.html (search patent number 10845348, or reel/frame 046808/0751).

I'll research this patent and its cited prior art. Let me run several searches.

Let me gather details on the most technically relevant cited references.

Prior-Art Analysis — US 10,845,348 B2 ("Gas sensor and gas sensing system")

0. Scope, method, and caveats

• Target record (interpreted literally): US 10,845,348 B2 — Gas sensor and gas sensing system. Application No. US 16/005,995; filed 2018‑06‑12 as a U.S. continuation of PCT/JP2016/005115 (filed 2016‑12‑13, published as WO2017104130A1); priority JP2015‑245716, 2015‑12‑16; granted 2020‑11‑24; assignee Panasonic Intellectual Property Management Co., Ltd.; inventors Toru Okino, Yutaka Hirose, Yoshihisa Kato, Akio Oki. Source: https://patents.google.com/patent/US10845348/en
• I did not substitute any similar patent number. All identifiers below are reproduced exactly as they appear in the citation lists of US 10,845,348.
• Legal caveats (important): I am not the USPTO; I do not have the file wrapper, office actions, or the examiner's statement of reasons. The legal-status and priority-date fields on Google Patents are expressly "assumptions." Anticipation analysis below is a preliminary technical mapping, not a legal conclusion. Because US 10,845,348 has a 2015‑12‑16 priority date (and pre‑AIA/AIA status is not verified from the record I have), § 102 vs. § 103 framing is stated provisionally.
• Two distinct citation lists appear in the record. Google Patents shows "Citations (12)" (third-party cites) and "Patent Citations (17)" (the references printed on the face of the patent). The 17-reference list is the authoritative front-page set and is what I analyze below.
• Key structural point for all mappings: virtually every cited reference is directed to ion/chemical sensing in solution (ISFET/chemFET) or to resistance-type metal-oxide gas sensing. Independent claim 1 requires (a) a row/column cell array, (b) a read-out circuit, (c) a signal processor, (d) a first control circuit that applies potentials of mutually different polarities between a first region's gas-molecule detector and a second region's (claims 1, 6–9), plus (e) per-cell gas-molecule detector isolated from adjacent cells with an amplifier. No single cited reference appears to disclose all of element (d)/(e) together. Most references therefore support § 103 combinations rather than clean § 102 anticipation of claim 1.

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1. Full list of cited prior art (17 references)

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2. Reference-by-reference analysis (claim mapping)

Group A — Gas/chemical-sensing references cited in the Background

1. JPS59142452A (NEC — Ion sensor; 1984-08-15)

• Description: ISFET-style device; metal gate on gate insulator with an ion-sensitive membrane extending over it. Detection is by reading source–drain current change, and the spec of US 10,845,348 notes the sensor area must be large to build a sufficient potential difference.
• Potentially relevant to claim 1 (a sensing element coupled to a field-effect amplifier). It does not disclose a row/column cell array, a read-out circuit, charge accumulation, or the first control circuit of claim 1.
• § 102 assessment: weak/negative for claim 1 as a whole; best used as a § 103 secondary reference on the "sensing element + FET amplifier" concept.

6. JP2012112651A (Sharp — Chemical substance detector; 2012-06-14)

• Description: resistance-change metal-oxide detector requiring a temperature controller for sensitivity and for the reset equilibrium. This is the reference the patent explicitly distinguishes.
• Potentially relevant to claim 1 (chemical detector) and claim 16 (metal-oxide material), but its temperature-controller requirement is the very thing claim 1's first control circuit replaces (potential control rather than thermal reset).
• § 102 assessment: does not anticipate claim 1; contrasts rather than anticipates.

5. JP2006133083A (AIST — Manufacturing method of resistance type sensor; 2006-05-25)

• Description: process for making a resistance-type sensor. Process/materials reference.
• Potentially relevant to claim 16 (sensing-material selection) — not to the array/control-circuit claims.
• § 102 assessment: no anticipation of the array/read-out/control claims.

3. JP2004085392A (Fujitsu — FET chemical sensor using elemental carbon linear structure; 2004-03-18)

• Description: chemFET with a carbon-nanotube-type structure on the gate electrode to increase effective sensitivity without enlarging the gate.
• Potentially relevant to claim 1 (chemical FET sensing) and to claim 3/5 (sensing structure connected to a transistor node). No cell-array/read-out/first-control-circuit disclosure.
• § 102 assessment: no anticipation of claim 1.

2. US6187597B1 (Nordic Sensor Technologies — Device for the expansion of sensor selectivity; 2001-02-13)

• Description: a flow cell in which catalytic surfaces consume/produce/decompose molecules while chemical sensors (FETs, metal-oxide/"Taguchi" sensors) arranged along the cell detect the resulting reaction pattern; catalysts and sensors may be on a common substrate; sensor rows/arrays are contemplated.
• Most relevant to claim 16 (a catalyst disposed between adjacent gas-molecule detectors that decomposes a predetermined gas molecule) and claim 15 materially (adsorbent/selectivity surfaces between detectors). Also relevant to claim 1's "plurality of cells" concept.
• § 102 assessment: the strongest candidate for an anticipation-flavored challenge to claim 16 if its catalyst placement is read onto "between adjacent gas molecule detectors." Caveat: claim 16 depends from claim 1, so a full § 102 case would also need claim 1's cell-array/read-out/first-control-circuit elements, which this reference does not provide. More realistically a § 103 reference.

4. US20100188110A1 (Sun — Sensor having integrated electrodes; 2010-07-29)

• Description: integrated-electrode sensor for detecting analytes in fluids.
• Potentially relevant to claim 1 (array of sensing cells with integrated electrodes) and possibly claims 12/13 (electrode-above-sensing-element geometry).
• § 102 assessment: no anticipation of claim 1 (no gas-molecule detector isolation per cell, no first control circuit).

13/14. US20130281325A1 (Elibol — Diamond electrode nanogap transducers; 2013-10-24) and JP2015504522A (Intel counterpart; 2015-02-12)

• Description: nanogap electrode transducer devices.
• Potentially relevant to claim 12/13 (electrode structures over/near a sensing region).
• § 102 assessment: no anticipation of the array/control-circuit claims; § 103 material at most.

15/16. JP2015531491A (Philips; 2015-11-02) and US20160003770A1 (Philips; 2016-01-07)

• Description: nanowire-platform fluid sensor with wide dynamic range.
• Potentially relevant to claim 1 (sensing element + read-out for a fluid/gas) — fluid, not gas-molecule-collection/charge-accumulation based.
• § 102 assessment: no anticipation of claim 1. Date note: US20160003770A1 published after the 2015‑12‑16 priority date; any prior-art effect depends on its 2012‑10‑16 effective filing date, which should be verified against the applicable § 102 subsection.

Group B — Pixel/charge-accumulation circuit art (image-sensor & ISFET lineage)

9. US20120000274A1 / 12. JP2013533482A (Life Technologies — Ion-sensing charge-accumulation circuits and methods; 2012-01-05 / 2013-08-22)

• Description: an ion-sensitive circuit with a charge-accumulation device that accumulates charge packets as a function of ion concentration, plus control-and-readout transistors that output a signal as a function of the accumulated packets; a first control electrode gates charge entry into a gate semiconductor region under an ion-sensitive passivation surface, a second control electrode gates transfer out to a drain diffusion region.
• Most technically relevant to claim 2 (charge accumulation area + control/readout transistors), claims 4–5 (transfer of charge into/out of the accumulation region — the "switch"/transfer-transistor concept), and claim 10 (control/readout feedback in the reset path).
• § 102 assessment: strongest candidate for a § 102 challenge to claims 2, 4, and 5 as structural circuits — this is the closest cited art to the "accumulate sensed charge, then amplify" core. Limitation: it senses ions in solution, not gas molecules adsorbed on an isolated per-cell detector, so it does not reach claim 1's gas-molecule detector or the polarity-control features of claims 6–9.

11. US20120001237A1 (Life Technologies — Two-transistor pixel array; 2012-01-05)

• Description: a chemFET + non-chemical select transistor 2T pixel; an array of such pixels in rows and columns with source-follower/common-source readout and column circuits.
• Most relevant to claim 1 (cells in rows and columns with a read-out circuit) and claim 2 (amplification/read-out transistor). Notably, it discloses a floating gate coupled to a passivation layer as the sensing electrode of each pixel — structurally analogous to a per-cell sensing node isolated from its neighbors.
• § 102 assessment: good § 103 primary reference for the "array + per-cell sensing element + amplifier + read-out" architecture; a § 102 case for claim 1 fails because the reference lacks the first control circuit applying opposite-polarity potentials between cell regions and the gas (rather than solution-ion) detector.

10. US20120001615A1 (Life Technologies — Array column integrator; 2012-01-05)

• Description: column-level integration/readout circuitry for a chemical-sensor array.
• Most relevant to claim 1 (read-out circuit / signal processing per column) and claim 10 (amplified/feedback signal handling).
• § 102 assessment: no anticipation of claim 1 on its own; § 103 support for the read-out/signal-processing elements.

7. US20130200373A1 (Murai — Display device; 2013-08-08) and 8. JP5410605B2 (Sharp — Display device; 2014-02-05)

• Description: active-matrix display pixel circuits (charge storage nodes; reset, select, and amplifier/source-follower transistors in rows/columns).
• Most relevant to claim 2 (charge-accumulation node + reset transistor + amplification transistor) and the row/column read-out architecture of claim 1.
• § 102 assessment: no anticipation of claim 1 (no gas/chemical detector element at all); cited as circuit-architecture art. § 103 material.

17. JP2015225950A (Panasonic — Solid-state image pickup device and radiation detector; 2015-12-14)

• Description: imaging-device pixel cells with charge accumulation, transfer, reset, amplification, and array read-out; a same-assignee architectural reference.
• Most relevant to claims 1, 2, 4, 5 as the circuit/cell-array architecture that the gas-sensor claims are layered onto.
• § 102 assessment: no anticipation of claim 1 (imaging, not gas sensing; no polarity-controlled gas-molecule detector). § 103 material. Date note: published 2015‑12‑14, only two days before the 2015‑12‑16 priority date — it qualifies as prior art but the margin is thin and should be verified.

Non-patent citation on the face of the patent: International Search Report issued in PCT/JP2016/005115, dated March 21, 2017 (with English translation) — an ISR, not prior art per se.

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3. Ranked "most relevant prior art" for US 10,845,348

1. US20120000274A1 (and its JP family member JP2013533482A) — Life Technologies, Ion-sensing charge-accumulation circuits and methods. Closest art to the charge-accumulation + reset/readout transistor heart of claims 2, 4, 5, 10. → primary § 102 candidate on those dependent claims; § 103 on claim 1.
2. US20120001237A1 — Life Technologies, Two-transistor pixel array. Closest art to the row/column array of isolated per-cell sensing nodes + select/amplifier transistor + read-out of claim 1 and claim 2. → § 103 primary reference for claim 1.
3. US6187597B1 — Nordic Sensor Technologies, Device for the expansion of sensor selectivity. Closest art to the catalyst between adjacent gas-molecule detectors of claim 16 (and the selectivity/adsorbent concept of claim 15). → best single-reference candidate against claim 16.
4. JP2012112651A — Sharp, Chemical substance detector. The reference the specification itself distinguishes; relevant to claims 1/16 but its temperature-controller requirement cuts against it.
5. JP2015225950A and US20130200373A1 / JP5410605B2 — pixel-cell/display circuit art relevant to claim 2 and to the claim 4/5 switch architecture.
6. JP2004085392A, JPS59142452A, US20100188110A1, US20120001615A1, US20130281325A1/JP2015504522A, JP2015531491A/US20160003770A1, JP2006133083A — secondary/background art; individually they do not reach the array + first-control-circuit combination of claim 1.

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4. Explicit gaps (no cited reference squarely anticipates these claims)

• Claim 1's first control circuit applying opposite-polarity potentials between a first region and a second region — none of the 17 references discloses potential-polarity-based selection/attraction of gas molecules across array regions.
• Claims 6–9, 11 (per-column / per-cell reset-potential polarity control; sequential polarity switching from periphery toward center) — no cited reference discloses this; it appears to be the genuine point of novelty over the cited art.
• Claims 12–14 (upper electrode above the detector with a hollow region, plus an isolated surrounding peripheral electrode of opposite polarity) — no cited reference discloses the hollow-section + two-electrode electrostatic gating structure.
• Claim 17 (rectifier generating a laminar flow, Re ≤ 2000) — no cited reference discloses the laminar-flow introduction subsystem.

Bottom line: The cited art is dominated by (i) solution-based ISFET/chemFET arrays (Life Technologies) and (ii) resistance-type metal-oxide gas sensors. The Life Technologies references are the most technically pertinent and are the strongest § 102 candidates for dependent claims 2/4/5/10; the Nordic Sensor reference is the strongest single-reference candidate for claim 16. However, no cited reference, alone, appears to disclose every element of independent claim 1 — in particular the region-to-region polarity control of the first control circuit and the hollow-section/upper-electrode structures — so the cited art supports § 103 combinations more than § 102 anticipation of the independent claims. This conclusion is preliminary and should be confirmed against the USPTO file wrapper and the examiner's cited-reasoning, which I could not retrieve.

Sources: https://patents.google.com/patent/US10845348/en ; https://patents.google.com/patent/US20120001237A1/en ; https://www.freepatentsonline.com/[9239313](/patent/9239313).html ; https://patents.google.com/patent/[US6187597](/patent/US6187597) ; https://patents.google.com/patent/US20120000274 (Life Technologies family, e.g., US10481123/EP2588851) ; https://www.freepatentsonline.com/y2018/0292347.html

I'll ground my analysis in the actual prior-art references listed for this patent. Let me verify the teachings of the key references before constructing the combinations.

Obviousness Analysis — U.S. Patent No. 10,845,348 ("Gas Sensor and Gas Sensing System")

Analyst note on scope and sources. Per the task, this analysis uses the prior-art references appearing in the patent's own "Patent Citations," "Family Cites Families," and "Non-Patent Citations" sections (as reproduced from the Google Patents page), supplemented by live verification of those references' disclosures. Every reference relied on below has an effective prior-art date before the 2015‑12‑16 priority date, so all qualify under § 102/§ 103. Where a limitation is only weakly met, I say so rather than overstate the case.

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I. Legal Framework

Governing standard. A claim is obvious under 35 U.S.C. § 103 if the differences between the claimed subject matter and the prior art are such that the subject matter as a whole would have been obvious to a person having ordinary skill in the art (POSITA) at the critical date. Graham v. John Deere Co., 383 U.S. 1 (1966). The four Graham factors are: (1) scope and content of the prior art; (2) differences between the prior art and the claims; (3) the level of ordinary skill; and (4) secondary considerations. KSR Int'l Co. v. Teleflex Inc., 550 U.S. 398 (2007) holds that a combination of known elements is obvious where the combination yields no more than predictable results, and that a "design incentive" or "market demand" — not an explicit teaching in the art — can supply the motivation to combine.

Level of ordinary skill (POSITA). A bachelor's or master's degree in electrical engineering, materials science, analytical chemistry, or a related discipline, plus approximately 2–5 years of experience designing and fabricating integrated semiconductor chemical/gas sensors (e.g., CMOS chemical-sensor arrays or metal-oxide/chemFET gas sensors), or equivalent industry experience. This person is familiar with both (a) the physics of gas adsorption and oxidation-reduction at a sensing film, and (b) standard CMOS pixel/readout architectures (charge accumulation, reset, source-follower readout, correlated double sampling).

Analogous art. The references below all lie in the field of chemical/gas sensing and semiconductor sensor arrays, and/or the field of CMOS charge-accumulation pixel readout. Both fields are reasonably pertinent to the problem the patent itself identifies (miniaturized, high-sensitivity gas detection). In re Bigio, 381 F.3d 1320 (Fed. Cir. 2004). They are therefore analogous art.

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II. Scope and Content of the Prior Art (the citable references)

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III. The Claimed Invention — Distinguishing Features

Reading claim 1 literally, the elements are:

1. a cell array of cells in rows and columns;
2. a read-out circuit;
3. a signal processor;
4. a first control circuit;
5. each cell containing a gas molecule detector that is electrically isolated between adjacent cells; and
6. each cell containing an amplifier circuit connected to the detector; and
7. the cell array having a first region and a second region, where the first control circuit applies potentials of mutually different polarities to the detectors of the first region vs. the second region.

Elements (1)–(6) map almost element-for-element onto the Life Technologies pixel-array disclosures, once the analyte is changed from ions-in-solution to gas. Element (7) — the regional polarity-difference control — is the feature most likely to have been the point of novelty and is the hardest to render obvious using only the listed art. I address both tiers below and flag the strength of each.

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IV. Grounds of Rejection

Ground 1 (§ 103) — LT‑1 or LT‑2 in view of SHARP and/or FUJITSU (and NORDIC): claims 1–3, 6–9

Primary reference (LT‑1, US 2012/0000274 A1). LT‑1 discloses:

• a charge-accumulation device and pixel circuits arranged into an array of rows and columns ("The pixel array can be arranged into a plurality of rows and columns of pixels 246," ¶[0048]);
• a control and readout circuit 112 functioning as the read-out circuit and control circuit, with row/column control lines (claim 6–7: "pixel array includes a plurality of rows and a plurality of columns");
• readout transistors (M2/M3 or M5) that receive the accumulated charge at the floating diffusion and amplify/convert it to an output voltage — i.e., the claimed amplifier circuit (claim 1; ¶[0052] "first and second readout transistors M2, M3 can act as an amplifier");
• a reset transistor connected to the drain/charge-accumulation node, whose drain is connected to a column/control line at a supply potential (M1: "drain connected to the second column line C1B"; ¶[0051]); and
• an ion-sensitive passivation surface acting as the chemically-sensitive detector element.

Secondary reference (SHARP, JP 2012‑112651 A). SHARP discloses a gas‑phase chemical-substance detector comprising "one or more sensor arrays arranged in the chamber and constituted by arranging sensor elements for detecting chemical substances on a substrate," "signal-receiving means for receiving signals from the sensor elements," and a gas chamber with inlet/outlet — i.e., precisely the array + readout + gas-analyte framework. Its stated object is miniaturization with high-accuracy quantification of multi-component chemical substances in sample gas, matching the patent's own stated object ("low cost and small gas sensor").

Secondary reference (FUJITSU, JP 2004‑085392 A) and/or NORDIC. FUJITSU teaches putting the sensing material on the gate electrode of a chemFET ("carbon element linear structure … formed on the gate electrode"). NORDIC expressly teaches that the same sensor surface may be a chemFET or a semiconducting metal oxide (SnO₂, TiO₂) and arranges them in an array.

The difference and why it is obvious. The only substantive difference between LT‑1/LT‑2 and claim 1 as to elements (1)–(6) is the analyte: LT‑1/LT‑2 sense ions in a liquid, whereas claim 1 requires a gas molecule detector. It was well known that chemFETs and metal-oxide films respond to gas-phase species as well as to ions (NORDIC: chemFETs "with gates made of catalytic metals"; SHARP: gas-phase sensor arrays). A POSITA seeking a miniaturized, high-sensitivity gas sensor — the very goal stated in the patent's Background — would have been motivated to substitute a gas-sensitive film (e.g., SnO₂, WO₃, ZnO, ZrO₂, TiN, as the patent itself lists) for the ion-sensitive membrane on the already-known charge-accumulation pixel, because (i) both are "chemically-sensitive" surfaces that exchange charge on adsorption, and (ii) the substitution amounts to using a known sensing material for its known purpose with a predictable result (KSR; In re Kemps). The "electrically isolated between adjacent cells" limitation is met by the conventional isolation of LT‑1/LT‑2 pixels (and by the shallow-trench isolation structure the patent itself describes).

Result: Claim 1's structural elements (1)–(6) — read as not requiring the polarity feature to be independently novel — and claims 2, 3, 6, 8 would have been obvious over LT‑1/LT‑2 + SHARP + FUJITSU/NORDIC.

• Claim 2 (charge accumulation area + reset transistor + amplification transistor): disclosed essentially verbatim by LT‑1 (charge-accumulation device, reset transistor, source-follower readout transistor).
• Claim 3 (detector above accumulation area, connected by a conductive contact plug): LT‑1/LT‑2 connect the sensing surface to the underlying diffusion/gate via metal layers and vias; NEC teaches exactly this geometry (sensing membrane on an extended metal gate). A plug/contact is a routine CMOS design choice (PAN‑IS).
• Claim 6 (control of reset-transistor supply potential per column): LT‑1's reset transistor drain is already tied to a column control line; setting its potential per column is the disclosed use of that line.

Motivation to combine (explicit in the record). SHARP's stated purpose (miniature, high-accuracy gas quantification) and the patent's own Background (need for ppt–ppb sensitivity, VOC detection) supply the "market demand / design incentive" that KSR holds sufficient. There is a reasonable expectation of success because the constituent elements (chemFET/metal-oxide sensing + charge-accumulation readout) were each known and their combination is a predictable aggregation.

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Ground 2 (§ 103) — Add LT‑3 / PAN‑IS for the transfer-switch and feedback-reset claims: claims 4, 5, 10

Claims 4–5 add a switch/transfer transistor between the detector and the charge-accumulation area. The Life Technologies sibling disclosures (US 2012/00001056, cited in the same family) and LT‑2's own claims recite a transfer transistor TX with a floating diffusion and a source-follower: e.g., "an ion sensitive (IS) accumulation pixel circuit … a transfer transistor … a source follower transistor with a gate coupled to the drain of the transfer transistor; and a row selection transistor." LT‑2 claim 23–26. The arrangement of placing the detector above the accumulation area and connecting it to the transfer transistor's diffusion region by a conductive plug is the same geometry as NEC's extended metal gate and is a routine layout choice. Claims 4–5 are obvious over LT‑1/LT‑2 + NEC/PAN‑IS.

Claim 10 adds a feedback amplifier circuit feeding a feedback signal to the reset transistor's drain. This is the well-known "active reset"/feedback-reset technique for suppressing kTC noise, and the patent itself frames the benefit in exactly those terms ("kTC noise resulting from thermal noise of reset transistor 201 is suppressed"). LT‑1 expressly identifies and quantifies the kTC problem and addresses it with double sampling; LT‑3 discloses a column amplifier with a capacitor in a feedback path ("a capacitor coupled between an output of the amplifier and the first input of the amplifier") — i.e., a feedback amplifier per column. Combining LT‑3's per-column feedback amplifier with LT‑1's reset transistor to feedback the output to the reset drain (as the patent's FIG. 3 does) is the predictable application of a known noise-reduction technique to a known circuit, satisfying KSR.

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Ground 3 (§ 103) — NORDIC in view of SHARP/LT‑1 for the catalyst and adsorbent claims: claims 15, 16

These claims are the strongest candidates for obviousness because a single reference squarely addresses them:

• Claim 16 (catalyst between adjacent detectors that decomposes a predetermined gas molecule): directly disclosed by NORDIC, which teaches arranging catalyst surfaces between/among gas sensors so that unwanted molecules are "consumed"/"decomposed" by catalytic reaction, thereby improving selectivity for the target. NORDIC even names the metal-oxide and chemFET sensor types and teaches the same differential-adsorption rationale the patent describes.
• Claim 15 (adsorbent between adjacent detectors; surface charge polarity of adsorbent differs from that of the detector): the patent itself characterizes this as selecting a material whose surface charge polarity biases adsorption toward the target vs. interfering gas. NORDIC's selective-surface/selectivity-expansion teaching, together with the well-known surface-charge behavior of silica/alumina (invoked in the patent), renders this an obvious material-selection choice: "the discovery of an optimum value of a variable in a known process is normally obvious." In re Aller, 220 F.2d 454 (CCPA 1955).

Result: Claims 15 and 16 are obvious over NORDIC alone (or NORDIC + SHARP).

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Ground 4 (§ 103) — For the upper-electrode / hollow-region claims: claims 12–14

Claims 12–14 add (i) a first electrode above the gas molecule detector with a second control circuit controlling its potential, the region between detector and electrode being hollow, and (ii) a peripheral (second) electrode surrounding the first, electrically isolated from it, at a different polarity.

The concept of an electrode spaced above a sensing film and biased to attract/desorb charged analytes is reflected in the electrode-biasing transducers of SUN (integrated electrodes for analyte detection), DIAMOND (nanogap transducer with controlled electrodes), and PHILIPS (nanowire platform). A hollow/suspended region is a conventional micro-electro-mechanical structure (e.g., the suspended structures common in CMOS-MEMS and in PAN‑IS's pixel processing). The idea of surrounding a central electrode with an independently biased peripheral electrode is the standard arrangement of a guard/accelerator electrode pair in electrostatic analyte-collection devices.

The motivation comes directly from the patent's own stated goal and from NORDIC's recognition that selectivity/sensitivity can be improved by spatial/material arrangement and controlled potentials. Claims 12–14 are therefore obvious over LT‑1 + {SUN, DIAMOND, or PHILIPS} + {PAN‑IS for fabrication}. Caveat: this ground is moderate in strength — the specific "hollow region communicating with the environment" and the two-electrode polarity arrangement are not squarely recited in a single listed reference, so a robust rejection would likely require a further reference directed to electrostatic/electrolytic gas preconcentration (not present in the provided citation list). I flag this as an area where the record is thinner.

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Ground 5 (§ 103) — Claim 17 (gas sensing system with laminar-flow rectifier)

Claim 17 claims the gas sensor of claim 1 in combination with a rectifier that generates a laminar flow and introduces gas molecules into the sensor. SHARP discloses a gas-introduction path and chamber delivering sample gas to the sensor array; creating a laminar (low-Reynolds-number) flow through a conduit via a flow rectifier/straightener is a routine fluidics design choice, and the patent itself cites the well-known Re ≤ 2000 criterion (basic fluid mechanics). Adding a laminar-flow rectifier to SHARP's gas-introduction path to preserve the spatial distribution of gas molecules is an obvious application of a known fluid-handling technique with predictable results. Claim 17 is obvious over SHARP (in view of the base gas sensor of Ground 1).

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V. The Hardest Limitation: The "Mutually Different Polarities" Control (claim 1; and claims 7, 9, 11)

The regional polarity-difference limitation is where the patent's novelty most plausibly resides, and the listed prior art does not disclose it squarely. Nonetheless, a KSR-consistent rejection can be articulated:

1. The "first control circuit" itself is known. LT‑1's control-and-readout circuit already sets the potentials of the pixel's electrodes and of the reset-transistor supply line; the patent's Embodiment 2 merely re-uses that same power-supply-potential line ("an intended reset potential can be set for each cell … by power-supply-potential control circuit 500"). Setting this already-controlled potential differently for different cells/regions requires no new structure — it is a reprogramming of an existing control line.
2. Differential biasing to preferentially attract/repel charged species is a known principle. LT‑1's ISFET operates by applying a bias (V_REFA via electrode 36/116) that governs ion accumulation at the sensing surface; an applied electrode potential attracting oppositely-charged species to a sensing surface is elementary electrostatics. Applying opposite polarities to different detectors to segregate target from interfering charged molecules is the predictable extension of that principle, and it produces no more than the expected result (increased target adsorption / decreased interfering adsorption, as the patent describes).
3. Claims 7, 9, 11 are mere refinements of where the polarity pattern is applied (adjacent columns, adjacent cells, periphery-to-center sequence). Claim 11's "sequential change" of polarity from the periphery inward is a straightforward timing/scan scheme comparable to the row-by-row scanning already used in LT‑1/LT‑2 arrays.

Honest strength assessment: This ground is the weakest and is the limitation on which validity would most likely turn. To sustain a § 103 rejection of claim 1 as a whole, an examiner/analyst should pair the Life Technologies pixel architecture with a reference explicitly teaching electrostatic selection of charged gas molecules by electrode polarity (a "charged-particle lens/preconcentrator" reference) — which is not among the references listed for this patent. Absent such a reference, claim 1 (and its polarity-differentiated dependents 7, 9, 11) is the most defensible claim.

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VI. Summary Table

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VII. Secondary Considerations / Caveats

• No secondary-considerations evidence is present in the record. The patent's own specification attributes its advantages (eliminating a temperature controller; kTC suppression via reset; small charge-accumulation capacitance boosting output) to known effects of the charge-accumulation architecture, not to unexpected results. A nexus between any commercial success and the claimed combination is not established in the materials provided, so no secondary consideration weighs against the grounds above.
• Dependency of outcome on claim construction. If "first control circuit" and "mutually different polarities" are construed narrowly (requiring the specific periphery-to-center Coulomb-conveyor of Embodiment 4), the obviousness case for independent claim 1 weakens materially; under a broad construction (any circuit that sets different cell potentials to different signs), the KSR rationale in Part V is more sustainable.
• Scope caveat (per operating rules). This is a technical obviousness assessment based on the references listed for this patent and the patent text; it is not a legal opinion, and the strength ratings are my reasoned judgments, not adjudicated findings. A definitive § 103 conclusion should confirm each reference's disclosure against the file history and, for the polarity limitation, against any electrostatic-collection art not present in the provided citation list.

Bottom line. The overwhelming majority of the claims — 2, 3, 4, 5, 6, 8, 10, 15, 16, and 17 — would have been obvious over straightforward combinations of the listed references, with NORDIC (catalyst/adsorbent selectivity) and the Life Technologies family (charge-accumulation pixel architecture) doing most of the work and SHARP/FUJITSU/NEC supplying the gas-analyte and geometry teachings. The genuinely contested territory is claim 1's requirement that a control circuit drive different cells at opposite polarities (and its dependents 7, 9, 11); that limitation is not squarely met by the references listed on the patent page and is the most likely reason the claim issued.