US 10697847

I'll verify the patent details and check for any litigation or CAFC docket activity involving this specific number.

Let me check for litigation/docket records more specifically.

US Patent 10,697,847 B2 — Verification Summary

I searched for the exact number 10697847 (and US10697847B2, 10,697,847). Below I reconcile what I could verify against the authoritative full text.

Bibliographic data (verified)

Abstract (as issued)

The disclosure relates to an overpressure encapsulation system for explosion protection, comprising: a device (1), in particular a painting robot; an overpressure-encapsulated device housing (2) with a housing outlet (6) for discharging gas out of the device housing (2); a compressed air system (3, 4) for operating the device (1) arranged within the device housing (2); a sensor assembly (7, 8, 9) for measuring at least one fluid variable (Q, P_I, P_A); and an analysis unit (11) which analyzes the fluid variable measured by the sensor assembly. The disclosure proposes that, when a leakage of the device housing (2) starts, the analysis unit (11) ascertains a remaining run time until a required maintenance operation or until a system failure on the basis of the measured fluid variable, and/or detects a fault (14, 16) of the compressed air system (3, 4) on the basis of the measured fluid variable. The disclosure further relates to a corresponding operating method.

Plain-language overview of the independent claims

Claim 1 — "remaining runtime" branch. A pressurized (overpressure-encapsulated) enclosure system for hazardous areas, made up of:

• (a) a device (e.g., a painting robot);
• (b) an explosion-protection overpressure housing around it;
• (c) an outlet in that housing that lets gas escape to the surrounding atmosphere;
• (d) a compressed-air system that operates the device and sits at least partly inside the housing;
• (e) a sensor assembly measuring at least one fluid variable (in the housing, at the outlet, and/or in the surrounding atmosphere); and
• (f) an analysis unit wired to the sensors that analyzes the measured variable.

The point of novelty (g): when a leak of the device housing begins, the analysis unit predicts a remaining runtime until required maintenance or system failure, based on the measured fluid variable. In other words, it forecasts how long until failure rather than merely flagging an already-existing leak (the stated shortcoming of WO 2007/074416 A2).

Claim 11 — "compressed-air fault detection" branch. Shares elements (a)–(f) verbatim with claim 1, but the characterizing element (g) is different: the analysis unit detects a fault of the compressed air system (e.g., a detached or burst compressed-air tube) from the measured fluid variable. Claim 11 does not require the housing-leak remaining-runtime feature; the two independent claims are alternative characterizations of the same hardware.

Note that each independent claim's "device" is generic, while dependent claims 3–10 and 13–16 hang off claim 2 / claim 12 respectively, both of which narrow "device" to a painting robot. So all the flow-volume, sensor-configuration, trend/threshold, and valve features are, as literally claimed, tied to the painting-robot species.

Dependent-claim mapping (for structure)

• Claims 2–10 depend (directly or indirectly) on claim 1: 2 = painting robot; 3 = analysis unit uses housing-outlet flow volume; 4 = internal-pressure sensor + ambient-pressure sensor, with flow volume computed from them; 5 = direct flow-volume sensor; 6 = quantitative (continuous) sensor signal; 7 = valve in the housing outlet; 8 = stored predetermined temporal course compared to measured course to compute remaining runtime; 9 = statistical trend ∩ predetermined threshold → remaining runtime; 10 = compressed-air system contains at least one of a pneumatically controlled coating-agent valve, a control valve, and a compressed-air line.
• Claims 12–16 depend on claim 11: 12 = painting robot; 13 = internal + ambient pressure sensors → computed flow volume; 14 = flow-volume sensor; 15 = quantitative sensor signal; 16 = valve in the housing outlet.

Litigation / CAFC 2026 check — negative result, with stated limits

• I found no CAFC docket, PTAB (IPR/PGR), District Court, or ITC record naming US 10,697,847. Searches for "10697847" combined with CAFC/Federal Circuit/2026, and for Dürr Systems litigation in 2026, returned nothing on this number.
• Caution on near-miss hits (do not conflate these with 10,697,847):
  • Fed. Cir. No. 24-2158 (opinion 2026-03-20), nonprecedential, is a Dürr appeal about spray-bell-cup patents (referred to as the ’804 and ’797 patents, pitting Dürr against EFC) — a different patent family, not 10,697,847.
  • A 2026 EPO Board of Appeal case (T 1052/24, Dürr Systems AG v. Volkswagen AG) concerns EP application 16745462.8 — not the EP member of this family (EP 3 377 869 B1, app. 16791525.5).
  • Search noise involving "847" in PTAB/ITC/Nike/Cellspin/Nikon filings concerns unrelated patents (e.g., 7,745,847; 9,749,847).
• The patent's own record shows only routine post-grant activity: maintenance fee payment (4th year) on 2023-12-20. Its listed expiry (2037-05-24) is an adjusted-expiration assumption, not a legal conclusion.

Uncertainty disclosure: I could not run a live, authenticated query against USPTO PatentCenter/PAIR or the CAFC docket system directly; my "no litigation found" conclusion rests on public web search results and the Google Patents record. It is possible a very recent or sealed docket entry exists that did not surface. The bibliographic, abstract, and claim data above are taken from the authoritative full patent text and are reliable; the litigation-absence finding should be treated as "none found," not "certified none."

I'll research litigation involving US Patent 10,697,847 across patent litigation databases and court records.

The initial searches didn't surface this specific patent. Let me search more targeted sources.

Litigation Search Results: US Patent 10,697,847

Bottom line: I found no litigation involving US Patent 10,697,847. Based on the searches conducted (Google Patents litigation/citation data, PACER-sourced dockets via CourtListener, Justia, Unified Patents-style case listings, Federal Circuit materials, and general web/industry reporting), there are no known district court, Federal Circuit, ITC, or PTAB proceedings in which this specific patent has been asserted, challenged, or otherwise litigated.

What the patent is and who owns it

• Patent: US 10,697,847 B2 — "Overpressure encapsulation system for explosion protection, and corresponding operating method"
• Application: US 15/774,131 (national stage of PCT/EP2016/001831)
• Priority: 2015-11-20 (DE 10 2015 015 089.8); Filed: 2016-11-04; Granted: 2020-06-30
• Assignee: Dürr Systems AG (Bietigheim-Bissingen, DE)
• Inventors: Jens Häcker, Alexander Carls
• Status: Active; adjusted expiration 2037-05-24
• Family: EP3377869B1, CN108474707B, KR102697646B1, ES2765736T3, PL3377869T3, WO2017084743A1
• Litigation-relevant history: No IPR/PGR, no reissue/reexam, no terminal disclaimer events beyond routine maintenance-fee payments (4th year fee paid 2023-12-20).

Important caveat on the Dürr litigation you may be thinking of

The searches surfaced a real, substantial Dürr Systems litigation campaign, but it does NOT involve the '847 patent. That case is:

• Dürr Systems, Inc. v. EFC Systems, Inc.
• Court: U.S. District Court for the District of Maryland (Southern Division)
• Case No.: 1:18-cv-02597 (GJH / later SAG)
• Filed: 2018-08-22
• Patents asserted: U.S. 6,189,804; 6,360,962; 7,017,835; 8,141,797; 8,590,813 (all rotary-atomizer "bell cup" patents — a different family entirely)
• Outcome: On 2024-06-28 the court granted EFC's cross-motion for summary judgment of non-infringement and entered judgment for EFC on all counts; Dürr's expert was excluded. Dürr appealed and the Federal Circuit (opinion citing Phillips v. AWH, Zenith, etc.) addressed claim-construction issues ("generally/substantially conical," "attached") and vacated/remanded the non-infringement ruling, ordering a jury trial under a corrected construction.

I flag this explicitly because it is the only Dürr patent-enforcement matter the search returned, and it concerns different patent numbers. Per your instruction not to return results for similar/other numbers, I am excluding it from the answer to your actual question — the '847 patent is not among the asserted patents, and the litigation does not involve it.

Conclusion

No litigation involving US Patent 10,697,847 is known or reported as of April 26, 2026.

Confidence and limitations

• I have high confidence that no well-publicized or docket-indexed litigation exists, given the patent is an active but niche industrial-equipment patent (explosion-protection overpressure encapsulation for painting robots) owned by an operating company (Dürr), which typically reduces NPE-driven assertion activity.
• I cannot guarantee completeness: PACER full-text searches are paywalled, some dockets are sealed, and recent (2025–2026) filings may not yet appear in free aggregators. If a definitive confirmation is required, a paid PACER "Party/Patent" search and a Unified Patents / Docket Navigator query on 10697847 should be run directly; my searches did not return any such record.

If you can share a specific docket number or party name you believe is associated with the '847 patent, I can attempt to verify it, but I will not manufacture a case that the sources do not support.

I'll verify the ODP result with web searches before reporting.

Let me try a couple more targeted searches on the patent and its family.

PTAB Proceedings Report — U.S. Patent No. 10,697,847 B2

Proceedings overview

Total AIA trial proceedings on file: 0. The USPTO Open Data Portal returns no IPR, PGR, or CBM proceeding for US 10,697,847 as of the most recent ingest, and my independent web searches (PTAB/PTACTS materials, Docket Alarm, CourtListener, general web) surfaced no AIA trial petitions, institution decisions, Final Written Decisions, or Federal Circuit appeals involving this patent — including no recently-filed or unindexed proceeding I could corroborate. Breakdown by status is therefore: active 0, claims invalidated 0, claims sustained 0, settled 0, institution denied 0.

Bottom line for a defendant: this is not a "patent survived two IPRs and is hardened" situation, and it is not a "claims 1–5 have been canceled" situation. It is an untested patent. All 16 issued claims stand exactly as granted on 2020-06-30, with no PTAB record to mine for claim-construction rulings, art-based invalidity findings, or estoppel. The defensive posture is therefore offensive latitude — the full § 102/§ 103/§ 112 playbook is unused, no petitioner estoppel exists, and the patent's ~11 years of remaining term (adjusted expiration 2037-05-24) means it could still attract a challenge. I flag one caveat below on the "absence of IPRs is a signal" point; here the more likely explanation is that the patent has never been asserted in a way that provoked a petition.

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No proceedings to report

There is no {PROCEEDING_NUMBER} — {Petitioner} v. {Patent Owner} entry to populate, because none exists on the USPTO record or in the sources searched. I will not manufacture a case number, panel, or disposition to fill this template — doing so would be the single most damaging thing a report like this could contain.

Two constraints from the prompt apply and I'm respecting them explicitly:

• The structured "PTAB proceedings on file" block governs; it reports no AIA trials.
• I am not auto-correcting or inferring a proceeding from adjacent Dürr-related litigation or from the foreign family.

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What I did find (and why it is not a PTAB proceeding)

To save you a wasted search, here is the nearby activity I checked and discounted:

None of these gives a defendant anything to cite against the ‘847 claims.

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Strategic summary

Claim status. Every claim is UNTESTED. Independent claims 1 and 11 remain in force, together with dependent claims 2–10 (depending from claim 1) and 12–16 (depending from claim 11). No claim has been canceled, narrowed, disclaimed, or held unpatentable by the Board or by a court on this record. Practically, this means the patent owner can assert claim 1 (the "remaining runtime" branch) or claim 11 (the "detect a fault of the compressed air system" branch) with no adverse PTAB claim-construction ruling and no judicially or administratively blessed narrowing of "remaining runtime," "fault of the compressed air system," or "quantitative sensor signal." Expect those terms to be litigated on a clean slate.

Estoppel landscape. There is no § 315(e)(2) estoppel attaching to this patent, from anyone, on any ground. For a defendant now being asserted against, the entire prior-art universe is available: § 102 anticipation, § 103 obviousness on any reference combination, and § 112 written description/enablement/indefiniteness challenges (note claim 4's calculation of flow volume from internal and ambient pressure — a ripe § 112 target). The prosecution-history citations are a useful starting point but not a ceiling: the file lists only nine references, including US 3,766,844 (Us Army), JP H05-115 111 A (Mitsubishi, gas-insulated switchgear — the specification itself calls this "foreign to the classification"), US 2006/0261192 A1 (Dürr Systems), WO 2007/074416 A2 (ABB), CN 102177002 A (Dürr), CN 102563362 A, JP 2013-111697 A (Kawasaki), and DE 10 2014 109 731 A1 (Wälischmiller). The examiner's citations are notably thin on automated trend-extrapolation / remaining-runtime art and on differential diagnosis of internal pneumatic faults — precisely the points of novelty the specification touts over WO 2007/074416 A2.

Pattern signals. No repeated petitioner (there are no petitioners). The patent owner has not had to defend a single AIA trial, so there is no PTAB-appeal track record and no evidence of aggressive appellate defense — this is an unanswered question, not a favorable data point. There is no defensive aggregator (e.g., Unified Patents) in the chain; no third-party challenge appears at all. One structural note worth weighing: because claim 1's "remaining runtime" feature and claim 11's "detect a fault of the compressed air system" feature are the express points of distinction over WO 2007/074416 A2 (per the specification), a well-built IPR would aim directly at those two pillars.

Timing knobs. PGR is time-barred (nine-month window closed ~2021-03-30, well before today). CBM is unavailable — this is a mechanical/pneumatic explosion-protection patent, not a "covered business method," and the CBM program sunset on 2020-09-16. That leaves IPR as the only AIA vehicle, subject to § 315(b): a petitioner served with a complaint alleging infringement more than one year earlier is barred. If your client has been sitting on a complaint, check that date first — it may close the door before the merits do.

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Recommended next steps

1. Do not treat the empty PTAB docket as confirmation of validity. It is not. It is an absence of challenge, which most commonly reflects that the patent has not been asserted against a well-resourced infringiter who had both the incentive and the § 315(b) window to petition. The ‘847 issued 2020-06-30 and runs to 2037-05-24; it is plainly challengable art-wise if the right art exists.

2. If you are a defendant facing assertion, run a pre-IPR prior-art sweep now, focused on: (a) process-control and condition-monitoring literature that predicts time-to-failure from a trending pressure or flow signal (the claim 1 "remaining runtime" concept), and (b) industrial/pneumatic diagnostics art that distinguishes a burst/sudden leak from a slow leak from normal valve venting based on a flow signature (the claim 11 concept, as detailed in FIG. 5, steps S4–S8). These are the two hinge limitations and the specification's own identified points of novelty over WO 2007/074416 A2.

3. Compute your § 315(b) deadline before anything else. If your client was served more than one year ago and is not in privity with any earlier-served party, IPR is likely unavailable and the invalidity fight belongs in the district court (where no PTAB estoppel or FWD cuts against you). If the window is still open, file early enough to preserve a joinder or follow-on option.

4. Where a platform exists, verify independently rather than relying on this report. USPTO PTAB E2E / PTACTS is the authoritative docket: https://ptacts.uspto.gov/ptacts/public-informations/ (search by patent number 10697847). Federal Circuit opinions are checkable on CourtListener (https://www.courtlistener.com) and the CAFC opinions page (https://www.cafc.uscourts.gov/opinions-orders). If a petition was filed but not yet docketed in ODP indices at the time of this report, PTACTS will show it first.

5. Recheck in 90 days. If this patent begins to be asserted, an IPR petition on the "remaining runtime" and "fault differentiation" limitations is the obvious next event, and the ODP ingest covered here would miss it. The absence of PTAB activity is a current-state finding, not a permanent one.

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Confidence statement. High confidence that no AIA trial proceeding is on file for US 10,697,847 as of the ODP snapshot and as corroborated by multiple independent searches returning nothing responsive. I could not, and did not, identify any IPR/PGR/CBM number, panel, institution decision, FWD, settlement, or Federal Circuit appeal for this patent — so I have reported none.

I'll verify the assignment record and current ownership status with targeted searches.

Let me check the corporate status of the assignee and any portfolio-level transactions.

Let me check for the attorney of record on this patent and any 2026 developments affecting the automotive/painting business.

Assignment & Ownership Reconstruction — US 10,697,847 B2

Sources used: USPTO-uploaded assignment data as mirrored in the Google Patents legal-events record for US 10,697,847 (AS event, 2018-07-03, Reel/Frame 046257/0616), the assignment face data restated there, the patent's own front-page/family record, and German commercial-register entries for the assignee. I was not able to complete an authenticated session against assignmentcenter.uspto.gov for this query (tool step budget exhausted mid-run), so the reel/frame and execution dates below are taken from the USPTO-derived legal-events mirror rather than read directly off the Assignment Center screen. All bibliographic anchors are from the authoritative full text supplied above.

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Inventors

Pattern check — the "inventors left within 12 months" red flag is NOT present, and the date arithmetic is benign:

• DE priority application DE 10 2015 015 089.8 filed 2015-11-20; PCT filed 2016-11-04; US national stage (App. 15/774,131) entered ~2018-05 (the fee/entity-status event is dated 2018-05-07).
• The inventors' assignment was executed 2018-06-28 / 2018-07-02 and recorded 2018-07-03 — i.e., after national-stage entry, which is the ordinary §371 formality (the USPTO requires a signed inventor→applicant assignment to perfect title because the PCT applicant is not automatically the US applicant's assignee of record).
• A 2.5-year gap between foreign priority and the US inventor assignment is routine for PCT national-stage cases. It is not a "departing inventors / portfolio fire-sale" signal.

Not determinable from available sources: whether either inventor is still employed by Dürr today, and there is no evidence of any inventor-side assignment to a third party (no such record exists on the patent).

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Original assignee

Entity named on the issued patent: Dürr Systems AG (Bietigheim-Bissingen, Germany). Original PCT/US applicant at filing was also Dürr Systems AG.

• Line of business: capital plant engineering for surface technology — paint shops, paint application technology, painting robots and applicators, final assembly, testing/filling technology. Dürr Systems AG is the principal German operating subsidiary of Dürr AG (Frankfurt: DE0005565204), a publicly listed group with ~€4.2 bn sales in 2025 and ~17,500 employees.
• Product embodying the claims: Yes, decisively. The patent is directed to overpressure encapsulation of a painting robot housing with in-housing compressed-air systems (claims 2, 10, 12) — exactly Dürr's flagship product. Dürr publicly reports shipping its 19,000th paint robot (to BYD, Hungary plant; >120 robots supplied). Claims 1/11 read on Dürr's own robot enclosures, which is why Dürr has never needed to buy this technology.
• Corporate status: Operating. Not acquired, not dissolved, not in bankruptcy. German register (Amtsgericht Stuttgart HRB 757705) shows the entity was created by formwechselnde Umwandlung (change of legal form) from Dürr Systems GmbH (formerly HRB 11125), with the new AG entry published 2016-08-10 (articles dated 2016-07-25). Registered office Carl-Benz-Str. 34, 74321 Bietigheim-Bissingen.
• Divisional/structural events (do not touch this patent): the Dürr Group divested its environmental technology (Clean Technology Systems) division to Stellex Capital Management LLC, signed 2025, closed 2025-10-31 (enterprise value ≈ €385 m; Dürr retained ~25%). That business is exhaust-air purification and sound insulation — not the painting-robot/overpressure-encapsulation subject matter of the '847 patent. Earlier, Dürr sold Agramkow (filling technology, closed 2024-07-01). Neither transaction is reflected in any assignment record for this patent.

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Assignment timeline

The chain is a single link. There is one recorded assignment, and it is the original inventor→applicant title transfer.

• 2018-06-28 to 2018-07-02 (executed) / recorded 2018-07-03 — Reel 046257/0616
  • Conveyance: Assignment (Assignment of assignors' interest — the legal-events record reads "ASSIGNMENT OF ASSIGNMENT INTEREST (SEE DOCUMENT FOR DETAILS)")
  • Assignor: Jens Häcker and Alexander Carls (natural persons, joint inventors)
  • Assignee: DÜRR SYSTEMS AG, Bietigheim-Bissingen, Germany
  • Correspondent: Not exposed in any source I could reach. Google Patents' legal-events table publishes assignor/assignee/reel-frame but not the recording correspondent; the Assignment Center cover-sheet field (attorney/firm of record) requires the Assignment Center record itself. I am not going to name a firm by inference. Verification path: Assignment Center → 10697847 → Reel 046257 Frame 0616 → "Correspondent" field, at https://assignmentcenter.uspto.gov/ (mirror: https://assignment.uspto.gov/patent/index.html). Recurrence flag: cannot be assessed — one link only, so no pattern is possible regardless of who the correspondent is.
  • Context: Routine §371 national-stage title perfection — inventors assign to the PCT applicant so the US applicant of record holds clean title. Not an acquisition, fire-sale, securitization, reorg, or transfer-to-asserter.

No other recordings exist. Specifically, there is no recorded:

• security agreement / collateral assignment (no lienholder of record);
• license, release, or correction;
• merger, change-of-name, or internal-reorg assignment;
• post-issuance assignment of any kind.

The only other legal events on the patent are administrative: FEPP 2018-05-07 (entity status set), STPP 2018-10-12 / 2020-02-20 / 2020-03-16, STCF patent grant 2020-06-10, and MAFP 2023-12-20 — 4th-year maintenance fee paid, large entity. A paid 4th-year fee is affirmative evidence the owner (Dürr) intends to keep the patent.

One nuance worth stating precisely, because it looks like a missing link but isn't: the priority application was filed 2015-11-20 under the name Dürr Systems GmbH, which four months later ceased to exist as a GmbH and continued as Dürr Systems AG (form change effective/publicised 2016-08-10). The PCT was filed 2016-11-04, i.e. after the change of legal form, and named Dürr Systems AG as applicant. That is why the US chain shows only "inventors → Dürr Systems AG" and no GmbH→AG assignment: a German Formwechsel is identity-preserving, not a transfer of title, so no US assignment record was required or filed. Do not read the absence of that record as a gap in the chain. (Inference flag: the identity of the German priority applicant as "GmbH" is inferred from the register timeline; the US/PCT record itself says AG.)

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Timeline diagram

timeline
    title Ownership of US 10697847
    2015 : DE priority application filed
         : Dürr Systems GmbH named applicant
    2016 : Legal form change to Dürr Systems AG
         : PCT application filed by Dürr Systems AG
    2018 : US national stage entered
         : Inventors assign to Dürr Systems AG
    2020 : US 10697847 B2 granted
    2023 : 4th year maintenance fee paid
    2025 : Dürr divests environmental tech unit
         : No transfer of this patent recorded

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NPE / troll-pattern signals

Additional ownership-relevant observation (not an NPE signal, but a control-change watch item): Dürr AG is being publicly discussed in the German financial press (Börse Online 18/2026) as a take-private / strategic acquisition candidate given its low valuation and net cash position. A change of control of the listed parent would not, by itself, move US 10,697,847 — German corporate law and US assignment practice both require an affirmative instrument of transfer for title to change, and none is recorded. There is likewise no recorded intra-group transfer from Dürr Systems AG to a US or IP-holding affiliate, so no patent-box structure has been created for this family.

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Verdict

Insufficient data — applying the rubric literally: the record contains only the original assignment (reel 046257/0616, 2018-07-03), which is the stated trigger for this category.

Justification, and a caveat on how to read that label: this is not an "ownership is murky" finding. Ownership is in fact unusually clear — a one-link, never-severed chain terminating at Dürr Systems AG, which is an operating manufacturer of the very product the claims cover (painting robots with overpressure-encapsulated housings and in-housing compressed-air systems per claims 2, 10, 12), has paid the 4th-year maintenance fee on 2023-12-20, and has never sold, securitized, licensed-of-record or abandoned the patent. Every one of the eight NPE signals is either not present or definitionally inapplicable. There is no NPE pattern here at all, and I would put high confidence on that.

If the taxonomy permitted a hybrid label, the substantively correct one would be "Operating-company holding, non-asserting" — it fails the strict "Operating-company assertion" test only because no competitor suit naming this patent exists, and fails "Defensive/non-asserting" only because no defensive aggregator is in the chain. Accordingly, if you are screening this number for troll risk, treat it as clean, and re-run the Assignment Center query directly to close the one genuine gap in this report — the correspondent/attorney field on reel 046257/0616, which no source I reached publishes:

• https://assignmentcenter.uspto.gov/ (search 10697847, or Reel 046257 / Frame 0616)
• Mirror: https://assignment.uspto.gov/patent/index.html

Standing uncertainties: (i) the correspondent of record is unknown to me and I have deliberately not guessed it; (ii) unrecorded licenses or side agreements would not appear in the assignment record and cannot be ruled out; (iii) a 2026-dated transfer, if executed but recorded after my sources were captured, would not yet be visible.

I'll verify the cited references against live sources, then map each to the claims it could anticipate.

I have strong material on the two key references. Let me verify the remaining citations.

Prior Art Analysis — U.S. Patent No. 10,697,847 B2

Reference search executed against: 10697847 (literal). No auto-correction applied. The authoritative full text (USPTO-derived record hosted on Google Patents) is my primary source; I supplemented it with live verification of the cited references. I could not run an authenticated PatentCenter/PAIR query directly — the citation set below is taken from the patent's own USPTO "Patent Citations" record, which I cross-checked against Google Patents/EPO/INPI/NIPO records for the individual references.

I found no contradictions with the previously generated sections of this analysis. This section extends the earlier "cited prior art of note" line item into a full element-by-element § 102 assessment.

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1. What § 102 anticipation would require here

The '847 patent has two independent claims that share identical elements (a)–(f) and diverge only in the characterizing element (g):

Because claims 3–10 depend through claim 2 (and 13–16 through claim 12), every dependent claim carries the "painting robot" limitation as well. A § 102 reference must therefore disclose all elements — including element (d) (an in-housing compressed-air system for operating the device) plus the (g) limitation — in a single reference, arranged as claimed.

Assessed outcome up front: no cited reference discloses element (g) in either branch. No reference computes a remaining runtime; no reference performs differential diagnosis of the in-housing compressed-air system (FIG. 5, steps S4–S8). The citations are therefore § 103 (obviousness) material, with § 102 positions colorable only for a narrow subset of claims, as detailed below.

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2. The cited references, one by one

2.1 WO 2007/074416 A2 — ABB AS ★ most relevant

• Full citation: WO 2007/074416 A2, "Integrated explosion protection apparatus for supervision and control of advanced electrical apparatuses," applicant ABB AS (NO); inventors Krogedal, Torkildsen, Brekken.
• Dates: PCT filing 2006-12-21 (PCT/IB2006/054993); published 2007-07-05; priority SE 0502927 (2005-12-28). Pre-AIA-publication art → § 102(a)(1) eligible (published >8 years before the 2015-11-20 effective filing date).
• Family (same disclosure): EP 1973709 B1 (granted 2017-06-28); US 2008/0287050 A1; CN 101351311 A.
• Description: Explosion-protection system for manipulators/industrial robots in hazardous (paint-booth-type) environments. Applies internal pressurized air into an explosion-proof enclosure with a purging system; an integrated flow-and-pressure sensor ("purge and pressure unit") at the enclosure, with a relief valve having a valve membrane and movement guide. The controller supervises both the inlet and the outlet of the enclosure, detects leakages before a purge sequence, and — per granted EP claim 5 — includes "means for controlling the leakage level during normal operation mode and to prevent uncontrolled downtime by applying the feedback as an input for the preventive maintenance program" (inspection/replacement of sealings, couplings). Source: Google Patents WO2007074416A2; EP 1973709 B1.
• Relationship to the '847: The specification names this reference expressly as the starting point and identifies its shortcoming: "the analysis unit in publication WO 2007/074416 A2 can only detect an existing leakage, which then requires the device to be switched off immediately."

§ 102 assessment — claims potentially anticipated:

Characterization: This is the strongest § 103 base — it supplies elements (a), (b), (c), (e), (f) and a preventive-maintenance feedback hook for (g). It is not a clean § 102 reference for either independent claim because of element (d) and the "remaining runtime" limitation.

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2.2 US 2006/0261192 A1 — Dürr Systems, Inc. ★ examiner-cited

• Full citation: US 2006/0261192 A1, "Robotic paint applicator and method of protecting a paint robot having an explosion proof electric motor," assignee Dürr Systems, Inc.; inventor Jürgen Haas et al.
• Dates: filed 2005-04-15; published 2006-11-23. § 102(a)(1) publication AND § 102(a)(2) US application publication (effectively filed before the '847 effective filing date). Family member: US 6,835,248 B2 (granted 2004-12-28).
• Description: Robotic paint applicator in a paint spray booth. A plurality of substantially air-tight robot housing enclosures each contain an explosion-proof electric motor with a gas inlet/outlet; a source of non-combustible gas purges the motor housings and robot enclosures and maintains positive pressure; a second discharge conduit coupled to the robot enclosure expels gas from the robot enclosure; a control unit operates an inlet valve to maintain a predetermined pressure; a transfer block separately controls motor-housing and enclosure pressure; servo valves S1/S2 and a brake valve are present. Source: Google Patents US20060261192A1.
• Relationship to the '847: Same corporate family (Dürr). Discloses the generic robot-enclosure-overpressure architecture, and this is the reference that most closely maps elements (a)–(c) and (e)–(f) for a painting robot specifically.

§ 102 assessment — claims potentially anticipated:

Characterization: Best § 103 companion to WO 2007/074416 A2 for the "painting robot + overpressure enclosure + purge + pressure control" architecture. Not an anticipatory reference for either independent claim.

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2.3 JP 2013-111697 A — Kawasaki Heavy Industries

• Full citation: JP 2013-111697 A, "Control system and method for articulated robot having inner pressure explosion-proof structure" (内圧防爆構造の関節ロボットの制御装置及び方法), applicant Kawasaki Heavy Industries, Ltd.
• Dates: filed 2011-11-29; published 2013-06-10. § 102(a)(1) eligible.
• Description: Control system/method for an articulated robot of internal-pressure (purged/pressurized) explosion-proof construction — pressurization and ventilation control of a robot housing serving an explosion-protection function (related disclosure in the same field: WO 2009/034789 A1, Kawasaki, inner-pressure-explosion-proof robot with sealed chambers, pressure detector and flow switch). Source: Google Patents citation record for the '847; Kawasaki K-series pressurized painting-robot product literature confirms the commercial class.
• § 102 assessment: Supplies elements (a), (b), (c), (e) and a control function for (f) in a robot context. No in-housing compressed-air system for operating the device (d); no remaining-runtime (g); no compressed-air-fault diagnosis (g'). → No claim anticipated; § 103 base on the enclosure/pressure-monitoring elements.

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2.4 CN 102563362 A — Hangzhou Zhejiang (杭州哲达科技股份有限公司) ★ relevant to claim 11's concept

• Full citation: CN 102563362 A, "Compressed air system and intelligent pipe network leakage detecting method for same," applicant Hangzhou Zhejiang Technology Co., Ltd.
• Dates: filed 2011-12-31; published 2012-07-11. § 102(a)(1) eligible.
• Description: Compressed-air distribution system with an intelligent pipe-network leakage detecting method — i.e., detection/diagnosis of faults within a compressed air system from measured operating variables.
• § 102 assessment: This is the citation that comes closest to the concept of claim 11's element (g') (detecting a fault of a compressed air system from a measured variable). However, it discloses none of the enclosure architecture (b), (c), (d)-as-arranged, or (e)/(f) in the '847's configuration, and it does not monitor leakage into a surrounding overpressure-encapsulated housing via the outlet. → No claim anticipated. It is, however, a high-value § 103 reference for a claim 11 obviousness challenge, because it shows that diagnosing compressed-air-system leakage from measured flow/pressure was known.

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2.5 CN 102177002 A — Dürr Systems (杜尔系统有限责任公司)

• Full citation: CN 102177002 A, "Coating device and corresponding operating method," applicant Dürr Systems.
• Dates: filed 2008-09-03; published 2011-09-07. § 102(a)(1) eligible.
• Description: Coating device and its operating method — the application-technology/coating-robot context in which the '847's painting-installation embodiment sits.
• § 102 assessment: Background/field reference only. Discloses a coating device but nothing addressing overpressure encapsulation, leakage trending, or internal pneumatic-fault diagnosis. → No claim anticipated; contextual § 103 reference at most.

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2.6 US 3,766,844 A — U.S. Army ★ examiner-cited

• Full citation: US 3,766,844 A, "Protective system for contaminated atmosphere," assignee United States of America (Army).
• Dates: filed 1971-12-21; published 1973-10-23. § 102(a)(1) eligible.
• Description: Protective shelter/enclosure system maintaining a positive-pressure (over-pressurized) interior against a contaminated external atmosphere, with pressure monitoring/alarm logic.
• § 102 assessment: Discloses the generic overpressure-enclosure-plus-monitoring concept (b), (c), (e), (f) in a non-robot, non-painting context. No device operated by an in-housing compressed-air system (d); no remaining-runtime (g); no pneumatic-fault diagnosis (g'). → No claim anticipated; the earliest general-art citation for the overpressure concept.

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2.7 JP H05-115111 A — Mitsubishi Electric Corp.

• Full citation: JP H05-115111 A, "Gas leakage monitor for gas insulated electric apparatus," applicant Mitsubishi Electric Corp.
• Dates: filed 1991-10-18; published 1993-05-07. § 102(a)(1) eligible.
• Description: Gas-leakage monitoring for gas-insulated electrical apparatus (gas-tight switchgear/transformer-type equipment).
• Note on the '847 record: the specification itself concedes this publication "is foreign to the classification in question, since it merely describes a gas-tight transformer."
• § 102 assessment: Leakage-monitoring concept only, in a different technical field. No element (b)–(g) in the claimed arrangement. → No claim anticipated; weak general-art citation.

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2.8 CN 2819200 Y — 王彭寿

• Full citation: CN 2819200 Y (utility model), "Device for testing priming product packing leakage," applicant 王彭寿.
• Dates: filed 2005-08-06; published 2006-09-20. § 102(a)(1) eligible.
• Description: Test apparatus for detecting leakage of product packaging/priming.
• § 102 assessment: Generic leak-testing device; no overpressure-encapsulated robot housing, no internal compressed-air system, no runtime prediction. → No claim anticipated; de minimis relevance.

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2.9 DE 10 2014 109 731 A1 — Wälischmiller Engineering GmbH ⚠ NOT § 102 prior art

• Full citation: DE 10 2014 109 731 A1, "Device with a protective gas-purged internal volume and apparatus and method for operating such a device," applicant Wälischmiller Engineering GmbH.
• Dates: filed 2014-07-11; published 2016-01-14.
• Description: A device having a protective-gas-purged internal volume, with apparatus and method for operating it — the specification cites it as a conventional inert-gas-purged explosion-protection robot, expressly noting "in this case there is no compressed air system arranged inside the explosion protection encapsulation to operate the robot and which can become defective."
• § 102 assessment — CRITICAL DATE POINT: Its publication date (2016-01-14) is after the '847's effective filing date (2015-11-20). It is therefore not available as § 102(a)(1) art, and — being a German national publication rather than a US patent or US application publication — it is not § 102(a)(2) art either. It also cannot serve as § 103 art, since § 103 operates only on § 102-qualifying prior art. → No claim anticipated; not prior art against the '847 at all. It is cited in the '847's background discussion, not as an anticipatory reference, and should not be relied on in any invalidity theory.

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2.10 DE 10 2013 103 823 B4 — R. Stahl Schaltgeräte GmbH (family citation, ⚠ verify independently)

• Full citation: DE 10 2013 103 823 B4, "Explosion-proof housing and method for monitoring sufficient tightness of the explosion-proof housing," applicant R. Stahl Schaltgeräte GmbH.
• Dates: filed 2013-04-16; B4 (granted) publication 2021-09-02. The underlying A1 publication (expected ~October 2014, 18 months after filing) would predate the '847's 2015-11-20 effective filing date — I have not independently confirmed the A1 date, so treat A1 availability as a verification item.
• Status on the '847 record: This appears in the "Family Cites Families" field — i.e., it was cited in a family member (e.g., the EP counterpart) rather than by the US examiner for the '847.
• § 102 assessment: Its subject matter — monitoring whether an explosion-proof housing remains sufficiently tight — is squarely on point for claim 1's premise. If the A1 was in fact published before 2015-11-20, it becomes a potentially significant § 102/§ 103 reference. As presented on the '847 record, it is not a US examiner citation, and I must flag the A1 publication date as unverified rather than assert it. → Potentially the most on-point reference not in the US citation list; independent verification recommended.

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3. Ranking — most relevant prior art

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4. Bottom line

1. No cited reference anticipates any claim of US 10,697,847 under 35 U.S.C. § 102. Every reference fails on at least element (d) (an in-housing compressed air system for operating the device) and/or element (g) in either branch (remaining runtime / compressed-air-system fault detection).

2. The two hinge limitations — (i) computing a remaining runtime to maintenance/failure from a trended fluid variable, and (ii) differential diagnosis of an internal pneumatic fault (valve venting vs. slow leak vs. burst/detached tube) — are precisely the points the specification touts over WO 2007/074416 A2, and no reference in the citation set discloses either.

3. WO 2007/074416 A2 (optionally combined with US 2006/0261192 A1) is the most relevant art and the natural § 103 combination against claims 1–10; CN 102563362 A is the natural § 103 reference against claim 11's compressed-air-fault detection. Notably, the examiner's citations are thin on both automated trend-extrapolation / time-to-failure art and industrial pneumatic differential-diagnosis art.

4. ⚠ Citation-timing defect to record: DE 10 2014 109 731 A1 (published 2016-01-14) post-dates the '847's 2015-11-20 effective filing date and is not § 102 or § 103 prior art. It appears in the '847's description as background, and the Chinese counterpart proceeding discussed it as background — but it cannot support an invalidity theory against the '847.

5. Tagging note from the record: Only US 3,766,844 A and US 2006/0261192 A1 (plus the US publication of the WO'416 family, US 2008/0287050 A1) carry the "* Cited by examiner" asterisk. WO 2007/074416 A2, JP H05-115111 A, JP 2013-111697 A, CN 102177002 A, CN 102563362 A, CN 2819200 Y and DE 10 2014 109 731 A1 were surfaced via the ISR/foreign-office actions (the record lists the CN Office Action of 2019-11-28 and the ISR/WO of 2017-01-26 as non-patent citations), not as US examiner citations.

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Confidence and limitations. The citation list, dates, claim text and specification quotations are taken from the authoritative full patent text and are reliable. Descriptions of the individual references are drawn from live Google Patents / EPO / INPI records and match the record; the WO 2007/074416 A2 and US 2006/0261192 A1 disclosures were verified directly. Two items rest on inference rather than verification and are flagged as such: (i) the array/title-level description of CN 102563362 A and JP 2013-111697 A (verified at citation/abstract level, not full-text); and (ii) the DE 10 2013 103 823 A1 publication date, which I did not confirm and which must be checked before that reference is used. The § 102 conclusions are analytical assessments of what each reference discloses, not legal opinions, and no reference was read in full where noted.

I'll ground the analysis in the actual prior-art references listed on the patent page. Let me verify the technical content of the key cited references before building the §103 combinations.

Good — I now have the key ABB reference's actual claim language. Let me verify the remaining cited references before building the combinations.

Obviousness Analysis — US 10,697,847 B2 under 35 U.S.C. § 103

Analysis date: April 26, 2026
Patent: US 10,697,847 B2 — Overpressure encapsulation system for explosion protection, and corresponding operating method (Dürr Systems AG; priority 2015‑11‑20; issued 2020‑06‑30)
Art base: the "Prior Art" section of the patent page — Citations (9), Patent Citations (11), Family Cites Families (1), plus the Non‑Patent Citations (2). I also use the specification's own admissions.

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1. Where the § 103 fight actually is

Every independent claim splits cleanly:

Because (a)–(f) are expressly admitted, the entire § 103 question collapses onto (g) and (g′) — exactly what the specification itself touts as the point of distinction ("The disclosure is distinguished from the prior art by improved analysis of the measured fluid variable").

Two structural notes that matter for the challenge:

• Claim 11 does not require the housing-leak prognostics at all. It reads on any WO′416‑type enclosure whose analysis unit additionally (or alternatively) flags a compressed-air fault. It is a narrower, cleaner target.
• Claim 1 is the broader, but arguably more vulnerable, target because the prognostics limitation is a pure data‑processing step applied to a signal the primary reference already measures.

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2. The reference set, and what each actually teaches

2.1 Primary reference — WO 2007/074416 A2 (ABB AS), Integrated explosion protection apparatus for supervision and control of advanced electrical apparatuses

Family: EP 1 973 709 B1, US 2008/0287050 A1, CN 101351311 A. Priority SE 0502927 (2005‑12‑28).

This is the single most important reference, and I was able to verify its actual text/claims, which is material because the patent's characterization of it is (as shown in § 6) inaccurate. Verified disclosures:

• Explosion protection system for "manipulators or industrial robots, located in hazardous environments," comprising "means for applying internal pressurized air into an explosion proof enclosure and that has a purging system and electrical components" → (b), (c), (e).
• An integrated flow‑and‑pressure sensor purge/pressure unit that: "controls the purge flow level"; "controls the pressure levels during Purging"; "controls minimum pressure level during operation to secure that the enclosure has a higher pressure level than the environment during operation"; and "controls the leakage level during operation mode."
• Body text: "controls the leakage level during operation mode and thereof be able to prevent uncontrolled downtime, 'fall safe design', by applying the feedback as an input for the preventive maintenance program, inspection and replacement of sealings, couplings etc."
• Claim 4: "means arranged to detect leakages before a purge sequence."
• Claim 5: "means for controlling the leakage level during normal operation mode and to prevent uncontrolled downtime by applying the feedback as an input for the preventive maintenance program."
• Sample text: "an optional solution is to integrate an additional Air maintenance regulator valve to compensate for leakages and thereof avoid shut‑down" and "reduce air supply consumption by only activating the air supply when a minimum level is reached."
• Sensor P3 "monitors the air flow during the flushing/purging sequence by measuring Delta‑P across the sensor nozzle."

→ (f) is squarely disclosed, and (g) is substantially foreshadowed: WO′416 already teaches continuous leakage‑level monitoring during normal operation whose output feeds a preventive maintenance program in order to prevent uncontrolled downtime. That is functionally claim 1(g) minus the explicit numeric "remaining runtime."

URL: https://patentimages.storage.googleapis.com/0d/c6/42/32b45263eee3c3/EP1973709B1.pdf

2.2 Secondary references (from the cited list)

Caveat on the "Similar Documents" panel. That panel also lists US 10,386,861 B2, EP 2 843 281 B1, EP 2 883 027 B1, US 8,429,951 B2, EP 3 306 292 B1 and US 2009/0007638 A1 (all flow‑monitoring / control‑valve / leak‑detection diagnostics). These are classification‑similar, not examiner‑cited art, and several post‑date the 2015 priority. Use them only as evidence that flow‑signature‑based anomaly diagnosis of valves and fluid systems was a crowded art by 2015, not as § 102/§ 103 references without checking each priority date. Note also that US 2018/0321109 A1 in that panel is the patent's own pre‑grant publication — not prior art.

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3. Combination A — renders claim 1 obvious

Primary: WO 2007/074416 A2 (ABB). Secondary: JP H05‑115 111 A (Mitsubishi), alone or with US 3,766,844 (Army).

The combination. WO′416 supplies (a)–(f) in full — including a robot‑enclosing overpressure/purge enclosure, an outlet, an integrated flow‑and‑pressure sensor, a purge/pressure controller, and continuous leakage‑level monitoring during normal operation whose output is fed to a preventive maintenance program to "prevent uncontrolled downtime." It lacks only a quantified remaining runtime. JP H05‑115 111 A supplies the missing technique: monitoring a sealed‑apparatus gas pressure over time to detect and characterise leakage — the well‑known GIS practice of trending insulating‑gas pressure/density and extrapolating to a lock‑out/threshold pressure to schedule make‑up gas or maintenance.

Motivation — express, not inferred:

1. WO′416 itself directs the artisan to the answer. Its claim 5 and ¶[0023] feed the leakage‑level measurement into a preventive maintenance program, and ¶[0020]–[0021] propose a "maintenance pressure valve" to "compensate for leakages and thereof avoid shut‑down." Once the artisan is told (i) measure leakage continuously during operation and (ii) use it for preventive maintenance to avoid downtime, the next step — converting a monotone leakage/pressure trend into a time‑to‑threshold estimate so the maintenance can be scheduled — is the ordinary, expected refinement. This is KSR's "known technique to improve similar devices in the same way" and "application of a known technique to a known device ready for improvement, to yield a predictable result."
2. Same field, same problem. Both WO′416 and JP H05‑115 111 address leak detection in a sealed, gas‑filled industrial enclosure/apparatus, and both are concerned with avoiding unscheduled outage. Artisans in explosion protection and in GIS condition monitoring are the same class of industrial‑equipment engineers, and both routinely use differential‑pressure/flow transducers (WO′416's P3 is literally a Delta‑P across a nozzle measurement).
3. Predictable result, no structural change. Substituting a trending/limit‑crossing evaluator for WO′416's threshold‑based leakage‑level control changes nothing physical — it is the same sensor, the same controller, a different curve fit. "Combining prior art elements according to known methods to yield predictable results" on identical hardware.
4. Design incentive / market force. The patent's own stated problem — "operation of the entire painting line has to be interrupted, which is very costly" — is a pure economic driver that would motivate any paint‑shop operator to convert a leak alarm into a maintenance‑scheduling forecast.

US 3,766,844 (Army) reinforces (c)/(e)/(f) and the claim‑7 valve feature: it discloses a pressurized protective shelter with an outlet, a pressure sensing network, a control/pressure sensing module and sliding‑plate airflow valves to control pressurization — i.e., that pressure‑sensed, valve‑controlled overpressure maintenance of an occupied enclosure was already a mature art four decades before the priority date.

Result on claim 1: obvious over WO 2007/074416 A2 in view of JP H05‑115 111 A (optionally with US 3,766,844).

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4. Combination B — renders claim 11 obvious

Primary: WO 2007/074416 A2 (ABB). Secondaries: CN 102 563 362 A + one of US 2006/0261192 A1 / CN 102 177 002 A / JP 2013‑111 697 A.

The gap in the primary reference is narrow and specific: WO′416's "internal pressurized air" exists for purging and explosion protection, not as a working pneumatic system "for operating the device." The patent exploits this distinction (element (d)). So the combination must supply (i) a working pneumatic system inside the explosion‑protected robot, and (ii) the diagnosis of faults in that system from the enclosure outlet signal.

The combination:

• US 2006/0261192 A1 (Dürr Systems) — the same patentee's robotic paint applicator with an explosion‑proof motor: establishes that a painting robot in a paint booth carries an internal, explosion‑protected drive/pneumatic package, and that the enclosure is protected by internal overpressure/purge. CN 102 177 002 A (Dürr) supplies the coating‑device operating method context. JP 2013‑111 697 A (Kawasaki) supplies the exact species of internal‑pressure explosion‑proof articulated robot with pressure detectors, a flow switch and pressure‑regulating valves in the gas supply/exhaust path (verified in the sibling Kawasaki document US 7,915,773 B2 / WO 2009/034789).
• CN 102 563 362 A supplies the missing analytical step: leakage detection in a compressed air system / intelligent pipe network from monitored flow‑pressure behaviour. This is the reference that teaches deducing a compressed‑air‑system fault from a monitored pneumatic variable — precisely (g′).
• WO′416 supplies the sensing and analysis hardware plus the continuous leakage‑level monitoring during operation.

Motivation:

1. The geometry forces the combination. A paint robot inside a purge‑pressurized enclosure necessarily contains pneumatics (coating‑agent valves, control valves, tubes) — the patent itself concedes such compressed air systems are "sufficiently known from conventional painting robots." Any artisan monitoring the enclosure's outlet flow must therefore contend with the fact that the outlet signal is confounded by internal pneumatic events. Detecting a fault in the pneumatic system from that same signal is the natural, obvious use of an already‑installed sensor — "use of a known technique to improve similar devices in the same way" and "obvious to try" with a finite number of predictable solutions.
2. Dürr's own art supplies the incentive. Having already (per US 2006/0261192 A1) built an explosion‑protected paint robot, the assignee's next design objective — early fault awareness without venting the hazard zone — is the ordinary design incentive a competitor would equally have felt.
3. CN 102 563 362 A is a direct TSM. It teaches that a compressed air system's leaks are diagnosable from monitored flow behaviour. Applying a known compressed‑air‑system diagnostic to the compressed air system that is known to sit inside a known monitored enclosure is the combination of familiar elements per known methods — predictable result.
4. No unexpected mechanism. A burst/detached tube dumping air into a closed, flow‑restricted enclosure must raise outlet flow; a slow pneumatic leak must raise it slowly. The physical causation is elementary and the diagnostic conclusion is a direct reading of the physics — the specification itself offers no unexpected result, only pattern recognition on a step/ramp signal.

Result on claim 11: obvious over WO 2007/074416 A2 in view of CN 102 563 362 A and one of US 2006/0261192 A1 / CN 102 177 002 A / JP 2013‑111 697 A.

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5. Combination C — the dependent claims

All dependents fall with the independent claims, but the additional limitations are independently obvious and mostly admitted:

Additional art located off the cited list (flag for any challenge). WO 2008/052711 A1 (ABB Technology AG, publ. 2008‑05‑01, priority 2006‑10‑28; equivalent ES 2 377 468 T3) is not on the patent's face, yet it is the closest art I found to claim 9, and its own background cites WO 98/55904 A ("device and method for predicting a trend‑sensitive error state … generating a data trend from a machine parameter, calculating the duration and slope of the trend for the prediction of a time period in which the trend exceeds a warning level") and US 2002/077792 A1 ("estimating the future development of the process variable and calculating the moment at which it reaches a limit value"). Those three documents materially strengthen a § 103 attack on claim 1(g) and claim 9, and I would run them before any IPR. (I retrieved these from search, not from the patent page's prior‑art list; treat the WO 98/55904 and US 2002/077792 characterisations as secondary‑source, to be verified.)

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6. Two findings that materially change the obviousness picture

6.1 The patent mischaracterises its own closest prior art

The specification asserts (three times) that WO 2007/074416 A2 "can only detect an existing leakage, which then requires the device to be switched off immediately and a maintenance operation to be performed." The ABB family text shows this is not accurate:

• WO′416 claim 5: "means for controlling the leakage level during normal operation mode and to prevent uncontrolled downtime by applying the feedback as an input for the preventive maintenance program."
• WO′416 body: "controls the leakage level during operation mode and thereof be able to prevent uncontrolled downtime, 'fall safe design' …" and ¶[0021]: a maintenance pressure valve to "compensate for leakages and thereof avoid shut‑down."
• WO′416 claim 4: leak detection before purge.

In other words, the very limitation the patent offers as its point of novelty for claim 1 — detecting an incipient leak early enough to schedule maintenance and avoid shutdown — is disclosed in substance by the reference the patent distinguishes itself from. This is a double‑edged finding: it strengthens the § 103 case (the primary reference already contains the motivation and most of the substance of (g)), and it is the kind of misstatement that invites scrutiny under the duty of candor and in the parallel EPO opposition (EP 3 377 869 B1).

6.2 "Applicant‑admitted prior art" does real work here

The Background section voluntarily concedes (b), (c), (d), (e) and (f) — including that pressure and flow volume measurements at a housing outlet with leakage identification are known from WO′416, and that compressed air systems inside painting robots are known. Under § 103 that admitted art can be relied on as the starting point (with the usual evidentiary caveats), which means the challenger need not prove those elements at all and can focus the entire case on (g)/(g′).

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7. The strongest non‑obviousness counterarguments (and why they likely fail)

A competent patentee will argue:

1. "WO′416 flags a leak; it does not compute a remaining runtime." True as a literal matter — claim 1(g) requires an ascertained remaining runtime, and WO′416's preventative‑maintenance feedback is not a time estimate. Rebuttal: motivation is express in WO′416 (preventive maintenance / avoid downtime / maintenance pressure valve), and the technique of converting a trending variable into a time‑to‑limit estimate is old and well‑documented (JP H05‑115 111's GIS pressure monitoring; WO 2008/052711 A1's stated purpose of computing "a point in time at which the process variable reaches a predetermined limit value"; WO 98/55904 A). KSR permits the conclusion where the improvement is a known technique applied to a known device with predictable results.
2. "The prior art never recognised that the enclosure outlet flow is confounded by internal pneumatic events, and never taught differential diagnosis (venting vs. burst vs. slow leak)." This is the patent's best argument, and it is aimed at claim 11 and the FIG. 5 logic. Rebuttal: (i) a diagnostic conclusion drawn from a step/ramp character in a flow signal involves no structural change to the apparatus — it is signal processing on an existing measurement; (ii) the art of distinguishing transient valve actuation from sustained leakage from slow drift in flow/pressure signals was crowded by 2015 (control‑valve diagnostics and fluid‑system leak detection art, e.g. the classification‑similar documents on the page; and CN 102 563 362 A for compressed‑air leak detection); (iii) the physical causation the patent relies on (burst → sudden sustained rise; valve vent → brief peak; slow leak → slow rise) is not an unexpected discovery, it is the direct consequence of the described plumbing.
3. Secondary considerations. The patent's specification supplies a classic "long‑felt need / avoid production shutdown" narrative. Rebuttal: there is likely no nexus between any commercial success and the analysis features (as opposed to the underlying explosion‑protection encapsulation, which is old); and the long‑felt‑need argument is directly undercut by WO′416's own express teaching of preventive maintenance to avoid uncontrolled downtime. A Rule 132 declaration asserting unexpected results would need to show something more than "we can now schedule the repair."

Where the case is genuinely weakest for the challenger: the claim 11 "fault of the compressed air system" limitation, because it requires a three‑reference combination (WO′416 + a working‑pneumatics reference + CN 102 563 362 A) and because the primary reference's "compressed air" is purge air, not working air — so element (d) is not literally met by WO′416 alone, and the motivation for the third reference must be articulated rather than assumed. The patent also arguably avoided the DE 10 2014 109 731 A1 (Wälischmiller) branch by pointing out that that art has no compressed air system inside the encapsulation — an implicit concession that the internal working‑pneumatics feature is what that reference lacks.

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8. Bottom line

The single highest‑value action is to develop WO 2008/052711 A1 and its cited background (WO 98/55904 A; US 2002/077792 A1) as primary art against claims 1(g) and 9, and CN 102 563 362 A as primary art against claim 11. Those four documents are not on the patent's face and appear to have escaped the examiner — which is consistent with the previously‑generated PTAB section's observation that "the examiner's citations are notably thin on automated trend‑extrapolation / remaining‑runtime art and on differential diagnosis of internal pneumatic faults."

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9. Confidence and limitations

• Verified from full text: WO 2007/074416 A2 / EP 1 973 709 B1 (claims 1–6 and body passages quoted above) and US 3,766,844 A (abstract and FIG. 18/22/31/54/55 description). WO 2008/052711 A1 abstract/¶ and its citations of WO 98/55904 A and US 2002/077792 A1 were retrieved via search of the primary document.
• Characterised from title + the patent's own description only (full texts not retrieved): JP H05‑115 111 A, CN 102 563 362 A, US 2006/0261192 A1, CN 102 177 002 A, JP 2013‑111 697 A, DE 10 2014 109 731 A1, DE 10 2013 103 823 B4, CN 2819200 Y. Their enablement of the specific limitations assigned to them in § 3–5 should be confirmed against full text (and, for the JP/CN documents, against certified translations) before any petition or invalidity contention is filed.
• JP 2013‑111 697 A vs. the Kawasaki sibling family: I verified the pressure‑detector/flow‑switch/pressure‑regulating‑valve disclosure in US 7,915,773 B2 / WO 2009/034789 A1 (Kawasaki, Robot with internal pressure explosion‑proof structure, priority JP 2007‑235029), which is a different document from the cited JP 2013‑111 697 A. Do not substitute one for the other; confirm JP 2013‑111 697 A's own disclosure before relying on it.
• Do not conflate: US 2018/0321109 A1 (listed in the page's "Similar Documents" panel) is this patent's own pre‑grant publication, not prior art. Consistent with the previously‑generated sections, I have not treated it, or the Dürr v. EFC rotary‑atomizer litigation, as bearing on this patent.
• Legal framing: the above is a technical § 103 analysis, not a legal opinion or a validity determination. No IPR has been filed (per the prior PTAB section), so all 16 claims stand untested and the full § 102/§ 103/§ 112 playbook remains available.