US 8019525

I'll search for this specific patent number across USPTO and CAFC docket sources.

US Patent 8,019,525 — Analyst Summary

Bibliographic data (as-issued)

Sources: Google Patents US8019525; FreePatentsOnline; Justia Patents.

Abstract (verbatim)

"A method and system for fuel vapor control in a hybrid vehicle (HEV). The HEV fuel vapor recovery system includes a fuel tank isolation valve, which is normally closed to isolate storage of refueling from storage of diurnal vapors. The method for fuel vapor control includes selectively actuating the fuel tank isolation valve during interrelated routines for refueling, fuel vapor purging, and emission system leak detection diagnostics to improve regulation of pressure and vacuum [in] the HEV fuel vapor recovery system."

Plain-language overview

The patent addresses a hybrid-electric vehicle (HEV) problem: because the engine runs infrequently and irregularly, there may not be enough engine-generated vacuum or heat-generated tank pressure to run the usual evaporative-emission leak test. The system splits the fuel vapor circuit into two sides with a fuel tank isolation valve (FTIV) — refueling vapors go to the carbon canister, diurnal vapors stay in the tank. Auxiliary hardware includes a canister purge valve (CPV) to the engine intake, a canister vent valve (CVV), a vacuum accumulator (VAV-controlled) that can be charged from the intake manifold, a body-mounted venturi, or brake-booster-pump exhaust, plus fuel-tank and canister pressure/temperature sensors.

The core insight is ordering flexibility: the leak check is sequenced depending on which side has usable pressure/vacuum, so both sides can still be tested (and the FTIV itself can be functionally verified) even when engine-on time is short.

Independent claims — plain language

Note: the authoritative text supplied to me covers the specification but cuts off before the claims. The claim characterizations below are drawn from secondary claim text (Justia US8019525 claims); treat the exact wording and count of independents as moderately confident, not verified against the printed claim set.

• Claim 1 — Method of monitoring a fuel vapor recovery system (adaptive order of pressure application). Covers a system with fuel tank↔FTIV↔canister↔CPV↔intake, canister↔VAV↔vacuum accumulator. Under a first condition, apply pressure to the fuel tank before the canister; under a second condition, apply pressure to the canister before the fuel tank. In either case, indicate degradation based on a change in a system pressure value after the pressure application.

• Claim 8 — Method based on monitored rate of change of fuel tank pressure. A leak-detection method whose degradation determination turns on the rate of change of monitored fuel tank pressure (with claims 10–13 elaborating FTIV-stuck-closed vs. FTIV/purge-valve/refueling-valve degradation under the first and second conditions).

• Claim 14 — Method tied to HEV battery state of charge and engine-off conditions. A method for a hybrid whose engine is selectively operated when battery SOC falls below a threshold, with a refueling valve, canister, and vacuum accumulator. During a first engine-off condition (fuel-tank absolute pressure above a threshold): pressurize the fuel tank first. During a second engine-off condition (fuel-tank absolute pressure below the threshold): pressurize the canister first and monitor tank and canister pressure. Degradation is indicated from the monitored pressure changes.

A useful cross-check: the sibling continuation US 8,447,495 carries the system side of the same disclosure (e.g., system claims reciting the FTIV, CPV, CVV, first/second pressure sensors, and staged purge-then-bleed control with the second purge amount adjusted based on the first) — see Justia US8447495 claims.

CAFC 2026 docket check — result and uncertainty

I searched for Federal Circuit and 2026 docket activity naming 8019525 and found no litigation or appellate records for this patent number. Specifically:

• No CAFC 2026 matter identified for US 8,019,525. I could not query the Federal Circuit's docket system directly; my searches returned nothing linking this number to an appeal, IPR, or district-court case.
• Ford-related 2026 activity exists, but on different patents. The 2026 PTAB/Ford matters that surfaced (e.g., Ford v. AutoConnect Holdings, IPR2025‑01383, concerning U.S. 9,290,153; Ford v. Versata) do not involve 8,019,525 and should not be conflated with it.
• A caution on identifiers: one FreePatentsOnline snippet references application "No. 12/790,792," while Google Patents lists 12/790,790 for this grant. I am reporting both literally rather than correcting either; the 12/790,792 reference most plausibly belongs to a cross-referenced/related filing, but I cannot confirm that from the retrieved snippets.

Explicit uncertainties

1. Full claim set not verified. The authoritative text provided ends mid-specification; the independent-claim count (I identified 1, 8, and 14) is inferred from secondary sources and may be incomplete.
2. Legal status ("Active") and anticipated expiration (2030‑05‑28) are as-stated on Google Patents, which disclaims any legal conclusion.
3. Primary examiner and attorney/agent firm appeared only in third-party profiles and are not corroborated authoritatively.
4. No litigation/CAFC history was found — this is a negative search result, not proof of absence.

I'll search litigation-focused sources for this specific patent number.

Let me run more targeted litigation-database searches.

Result: No litigation located involving U.S. Patent 8,019,525

I ran targeted searches against litigation-oriented sources and full-text web indexes using both identifier forms — 8019525 and 8,019,525 — paired with patent-litigation terms. I found no district court case, no ITC investigation, no PTAB proceeding (IPR/PGR/CBM), and no Federal Circuit appeal in which U.S. 8,019,525 is the asserted or challenged patent.

What I searched and what came back

The only search result that even contains this patent number as a patent is the patent itself and two aggregator inventor-profile pages (patentleaderboard.com profiles for Kacewicz and Kragh, listing 8019525 among their Ford patents). Neither is a litigation record.

Case-by-case table

None. There is nothing to tabulate — no plaintiff, defendant, jurisdiction, case number, filing date, or status exists in the sources I could reach.

Was it ever asserted or challenged?

No evidence of either. Considerations that make an assertion plausible in principle — it is an Active patent with a 2030‑05‑28 anticipated expiry on Google Patents, assigned to Ford Global Technologies, with a foreign family (DE 102011075177 A1, CN 102312756 B) and a continuation (US 13/170,893 → US 8,200,411 B2) — but no assertion or validity challenge appears anywhere I searched. Evaporative-emission diagnostics patents are asserted relatively rarely (they tend to be practiced by the OEMs themselves rather than by NPEs), which is consistent with a clean record.

Cross-reference flags (per the instructions to surface contradictions)

1. Continuation identity. The previously generated section referred to a "sibling continuation US 8,447,495" as carrying the system claims. The authoritative Google Patents record supplied to me lists the continuation as US 13/170,893 → US 8,200,411 B2. These cannot both be the same child. I am flagging rather than reconciling this: the system‑side claims described may well reside in a different continuation, but on the authoritative text the identified continuation is 8,200,411, not 8,447,495. This does not affect the litigation finding — neither number appears in any docket I retrieved.

2. Application number. As noted in the prior section, a FreePatentsOnline snippet referenced application 12/790,792 while the authoritative record gives 12/790,790. Reported literally, uncorrected; immaterial to the litigation question.

Caveats on this negative result

• This is a negative search result, not proof of absence. I could not query PACER, Docket Navigator, LexisNexis CourtLink, or Unified Patents' caselist directly (no authenticated access), and I could not query the CAFC docket system directly. My coverage rests on public web indexes and the litigation PDFs those indexes surfaced.
• Search budget was exhausted mid-run, so a small number of additional query formulations were not attempted.
• Unasserted patents leave no litigation trace by definition. For a 2011‑issue Ford emission-control patent, the absence of a record is the expected state, and the negative finding is consistent with, but not dispositive of, "never litigated."

Bottom line for the file: as of April 26, 2026, no litigation, PTAB proceeding, ITC investigation, or CAFC appeal involving U.S. Patent 8,019,525 has been identified. Do not conflate it with the Ford‑related 2024–2026 matters on the MIT/Ethanol Boosting or AutoConnect patent families, which involve entirely different patent numbers.

I'll verify the structured data's negative result with targeted searches before reporting.

Proceedings overview

Total AIA trial proceedings on US 8,019,525: 0 — no IPRs, no PGRs, no CBMs, whether active, instituted, denied, settled, or decided. The canonical structured "PTAB proceedings on file" block (USPTO Open Data Portal) returns an empty set, and independent web searches surfaced nothing to contradict it; the default characterization of "no PTAB activity on file" holds.

The bottom line for a defendant: the patent is completely untested at the PTAB. All claims stand as issued, with no PTAB cancellation, no statutory disclaimer, and no adverse Final Written Decision on the books. This is the opposite of the "hardened after two IPRs" scenario — it means every ground of § 102/§ 103 you can find is available and unestoppled, but it also means you have no free rides from a prior petitioner's work product. A first-filed IPR here would be a genuinely clean slate.

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Proceedings on file

None

There is no proceeding to report. I am stating that plainly rather than padding the section with false structure.

How I verified the negative:

Identifiers that must not be conflated with this patent (these appeared in my searches and all belong to other patents):

• IPR2019‑01399 / ‑01400 / ‑01401 / ‑01402 and IPR2020‑00010 / ‑00011 / ‑00012 / ‑00013 — Ford Motor Co. v. Ethanol Boosting Systems, LLC and MIT, challenging US 9,810,166; 8,069,839; 9,255,519; 10,138,826. Different technology (ethanol-boosted direct-injection fuel management), different patent owner orientation (Ford is the petitioner).
• IPR2021‑00339 / ‑00340 / ‑00341 — same parties, challenging US 10,619,580; 10,781,760; 9,708,965. Institution denied in these. Affirmed on appeal per Law360 (2025‑12‑23) as to the three MIT fuel-management patents — an MIT loss, not a Ford patent matter.
• IPR2023‑00763 / ‑00764 — Ford petitions against Neo Wireless patents in the Neo Wireless MDL.
• One search hit grouped the string "8019525" with a Netlist W.D. Tex. case ("'525 W.D. Texas case"). That is a case number coincidence (6:20‑cv‑00525), not US 8,019,525, and not a PTAB proceeding.
• A Justia hit showed "8019525 | September 13, 2011 | DeBastos et al." in the reference list of US 12,269,315 — that is 8,019,525 being cited as prior art in a later application, not being challenged.

Caveat on my own diligence: this is a negative search result, not affirmative proof of absence. PTAB E2E does not expose a clean public "proceedings-by-patent-number" endpoint to me in this session, and the ODP ingest can lag recent filings. If you need certainty (e.g., you are weighing a § 315(b) or estoppel position), pull the Patent's "Proceedings" / "Patent Trial" tab on PTAB E2E and the file wrapper directly. What I can say with high confidence: nothing indexed, archived, or widely reported connects this patent to a PTAB trial.

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Strategic summary

Claim status. Claims 1–14+ (the full as-issued set) are all UNTESTED — none canceled, none sustained after challenge, none disclaimed. There is no narrowing through IPR/CBM, so the claim scope you must design around is the original issued scope. Whatever the issued claims cover, that is the exposure, unmodified by any Board or Federal Circuit decision. (I still flag the inherited caveat from the earlier section: the full claim set was not verified against the printed claims in this session, and my earlier identification of independents 1, 8, and 14 came from secondary sources. Before relying on any specific claim in a defense, pull the printed claims from the USPTO PatentCenter file wrapper.)

Estoppel landscape. There is no § 315(e)(2) estoppel running against anyone on this patent, because no IPR/PGR was ever instituted. That cuts both ways for you:

• No inherited art record. You cannot free-ride on a prior petitioner's expert declarations, grounds, or Board findings; you would bear the full cost of a first-challenge record.
• No estoppel trap. By the same token, nobody — including Ford or its privies — is estopped from anything. If Ford is your adverse party and you have your own IPR in mind, note Ford's demonstrated appetite as a PTAB petitioner (Ford v. MIT/EBS, Ford v. TMC, Ford v. Neo Wireless); a well-funded patent owner with PTAB experience is a realistic risk on the other side of your petition.
• Front-loaded cost. A real Fintiv/discretionary-denial risk exists if you are already in district court; § 314(a) discretion is where first-filed IPRs against engine-control patents are most likely to die, not on the merits.

Pattern signals. Ford Global Technologies' own patents in this evaporative-emissions family have not attracted defensive-aggregator attention. No Unified Patents, no RPX, no IPR cluster. That is somewhat unusual for a Ford emission-control patent with a 2030 expiration, and it suggests either (a) the claim set is narrow enough that accused products route around it, or (b) the patent has simply never been asserted in a way that made an IPR worth anyone's money. The absence of any district-court assertion I could find supports (b).

One genuinely useful asset in the record. The specification itself cites and distinguishes two prior-art references — Ito et al., US 6,557,401 and Takagi et al., US 6,761,154 — as the closest known approaches, and the patent's stated point of novelty is the ordering of pressure/vacuum application based on availability of pressure/vacuum, not the hardware. That framing is a roadmap for a § 103 attack: the inventor's own admission in the BACKGROUND AND SUMMARY identifies the closest art, and the alleged improvement is an ordering/control-logic difference over known hardware (FTIV, CPV, CVV, vacuum accumulator, FTPT, CPT). Hardware-level claims with control-logic distinctions are vulnerable to obviousness arguments built on admitted prior art plus a secondary reference or the knowledge of a POSITA.

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Recommended next steps

If you are a defendant being asserted against (or demand-lettered):

1. Get the claims. The authoritative text I was given cuts off mid-specification. Pull the printed claim set from USPTO PatentCenter for application 12/790,790. Do not draft invalidity contentions off secondary claim summaries.
2. Confirm the zero-PTAB finding at the source: the patent's PTAB "Proceedings" tab on PTAB E2E, plus a Docket Navigator / CourtListener check on the patent number for any unindexed AIA trial. Link the results into your file as a dated diligence memo.
3. Mind the § 315(b) clock. If you have been served with an infringement complaint, your one-year window to petition runs from service. Because there is no prior petition, there is also no § 315(a)/(e) drag on you — but there is also no prior art record to steal.
4. Build grounds from the patent's own admissions. Start with US 6,557,401 (Ito) and US 6,761,154 (Takagi) — both cited in the specification — combined with art teaching accumulator-based vacuum storage and adaptive leak-check sequencing. The "first condition / second condition" ordering limitation is the likely non-obviousness battleground, so the petition should attack it directly with art showing conditional test sequencing.
5. Consider parallel validity tools. Ex parte reexamination is available (no petitioner-estoppel price tag) and the patent does not expire until the 2030‑05‑28 anticipated date, so an IPR is timely.
6. Watch for a Priority/§ 112 angle. Because the asserted novelty is control logic, expect indefiniteness and written-description fights over "applying a pressure" (which the spec uses to mean either positive pressure or vacuum), the "threshold 5"-style thresholds, and the first/second condition definitions. Reserve those for district court — an IPR cannot reach § 112.

If you represent the patent owner (Ford Global Technologies):

• The patent is intact and unchallenged; its value is undiluted. That is a strong posture, and a first IPR would be a genuine attempt to break new ground rather than finish existing work.
• The single largest exposure is that the specification's admitted prior art is unusually close on hardware — a fact you would have to litigate on the "adaptive ordering" limitation. Consider whether any continuation-claim amendment strategy (family includes US 8,200,411 and US 8,447,495) improves your claim-scope/validity tradeoff before an assertion invites a petition.
• If you assert this patent, expect the defendant to file an IPR within the § 315(b) year and to move to stay. Your best stay-opposition material is the absence of any prior PTAB record and the short remaining life on a 2030‑05‑28 expiration (which shortens the stay's efficiency gain and is not typically dispositive, but it is a factor).

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Sources consulted: Google Patents US8019525; Justia US8019525; USPTO PTAB E2E; CourtListener; Docket Alarm PTAB — IPR2021‑00340; Law360 via Lawyers Weekly — Fed. Cir. affirms MIT fuel-management invalidation (2025‑12‑23).

Explicit uncertainty restated: the "zero proceedings" conclusion rests on (i) the structured ODP block supplied in this prompt and (ii) negative web results. I could not query PTAB E2E programmatically in this session. Treat this as a well-supported negative, not a certified null set.

I'll research the assignment record for this patent before drafting.

Assignment & Ownership Analysis — US 8,019,525 B2

Research result up front: this patent has one recorded assignment event in USPTO records — the original inventor-to-Ford transfer. There is no post-issuance chain. I could confirm the event from Google Patents legal events, but I could not retrieve the reel/frame number, the recording date field, or the correspondent of record from the Assignment Center itself (the Assignment Center search UI is not retrievable via my available tools, and my targeted searches for the reel/frame returned no hit for this number). I will not manufacture a reel/frame. Everything below is labeled by confidence.

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Inventors

Basis for "Ford Motor Company": the recorded assignment runs from all eight inventors to Ford Global Technologies, LLC, and Ford's standard assignment instrument (recurring across its filings) recites that the inventor acts "[p]ursuant to my employment agreement heretofore made or by contractual obligation" and conveys to "FORD GLOBAL TECHNOLOGIES, LLC, a Ford Motor Company subsidiary… having its principal place of business at Dearborn, County of Wayne, and State of Michigan." That language pattern is directly visible in Ford assignment instruments recorded with USPTO (e.g. legacy assignment PDF, reel 028229/0311). I have not seen the executed instrument for this patent, so the employer call is an inference from the assignee identity plus Ford's uniform practice, not a reading of the document.

Unusual patterns: None detected. This is a classic large-automaker employee-inventor group: eight co-inventors, all obligating to the same corporate assignee, no partial assignments, no inventor retaining rights, no inventor departure signal visible. Longer inventor teams (8 named inventors) are normal for Ford powertrain/emissions control filings. Note the prior section's caution that FreePatentsOnline rendered an application number of "12/790,792" while Google Patents gives 12/790,790 for this grant — that discrepancy is not resolved here, and if 12/790,792 is a real sibling filing it would carry its own assignment record.

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Original assignee

Ford Global Technologies, LLC (Dearborn, Wayne County, Michigan). Google Patents lists it as both original and current assignee, legal status Active, anticipated expiration 2030-05-28.

• Entity type / function: Ford Global Technologies, LLC is a wholly owned Ford Motor Company subsidiary used as the group's IP-holding company (Delaware LLC; principal place of business Dearborn, MI). It is not a licensing-only shell — it is the title-holding vehicle for Ford's worldwide patent portfolio, and it also appears as the correspondent/owner in Ford's own TTAB matters (Owner address: One American Road, 4th Floor, Ford World Headquarters Bldg., Dearborn, MI 48126) — see TTABVUE 91283930.
• Failure to ship a product embodying the claims? No — the opposite. Ford ships the accused-class product: the disclosure is directed at plug-in hybrid electric vehicle evaporative-emission control (fuel tank isolation valve, canister purge valve, vacuum accumulator), i.e., production HEV/PHEV fuel systems. Ford is an operating automaker.
• Current corporate status: operating; no bankruptcy, no acquisition, no dissolution. Ford Motor Company is an SEC registrant.
• Change of name history: none recorded for this patent; the original assignee name has been stable since recordation.

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Assignment timeline

Execution date: not verified. Recording date: 2010-06-01 — Reel not retrieved / not verified (see note).

• 2010-05-28 (application filing) → recorded 2010-06-01 — Reel not verified; Frame not verified
  • Conveyance: Assignment (Assignment of Assignors' Interest) — as stated on the Google Patents legal-events entry ("ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS)").
  • Assignors: BOHR, SCOTT; KACEWICZ, JOHN MICHAEL; SULLIVAN, PATRICK; KRAGH, CHRISTOPHER; KLUZNER, MICHAEL IGOR; PEARCE, RUSSELL RANDALL; DEBASTOS, TIMOTHY; EULISS, WILLIAM (assignor naming as recorded by Google Patents legal events; note ordering differs from the patent front page).
  • Assignee: FORD GLOBAL TECHNOLOGIES, LLC.
  • Correspondent: Not retrieved. I cannot name the recording attorney/agent for this reel. Ford's publicly visible patent/TTAB correspondence address is Ford Global Technologies, LLC, One American Road, 4th Floor, Ford World Headquarters Bldg., Dearborn, MI 48126, with Sharon C. Sorkin appearing as Ford's named correspondent in a TTAB opposition — but that is a trademark-correspondent data point, not the assignment-record correspondent for this reel, and must not be treated as the reel-level correspondent.
  • Context: Ordinary pre-issuance employee-inventor assignment to the corporate parent's IP-holding subsidiary — not a fire-sale, reorg, securitization, or transfer-to-asserter.

Post-issuance: No subsequent assignments, security interests, mergers, changes of name, licenses, releases, or corrections are recorded against US 8,019,525 in the sources I could reach.

Related-family note (not an assignment of this patent): US 13/170,893 — a continuation of this application — issued as US 8,200,411 B2 and is separately listed under Ford Global Technologies. Its existence is a family-continuation signal, not a title transfer of the '525 patent. The foreign filings (DE 102011075177 A1, pub. 2011-05-03; CN 102312756 B) are foreign counterparts filed by Ford, likewise not assignment events for the US grant.

Negative-with-caveat: per the task rubric, "many patents have no recorded post-issuance assignments — that is itself a finding." Here the finding is stronger than a blank record: there is exactly one link, original inventors → Ford. I am stopping the timeline at that link. The only gap is my inability to read the reel/frame and correspondent off the Assignment Center page; that is a tool-access limitation, not evidence of an unrecorded transfer.

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Timeline diagram

timeline
    title Ownership of US 8019525
    2010 : Eight inventors assign to Ford Global Technologies LLC
         : Application 12790790 filed
    2011 : Patent US 8019525 B2 issued
    2011 : Continuation app 13170893 filed
         : Continuation issues as US 8200411 B2

No further events to plot: there are no recorded post-issuance transfers.

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NPE / troll-pattern signals

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Verdict

Insufficient data.

Justification: the reconstructed chain contains exactly one link — eight Ford employee-inventors assigning to Ford Global Technologies, LLC, recorded 2010-06-01 (reel/frame not retrieved) — with no post-issuance assignments, security interests, or litigation anywhere in the record. Under the rubric this maps to "Insufficient data (no records, or only the original assignment)" rather than to any NPE or defensive-aggregator category, because nothing has occurred beyond the routine corporate original assignment; note that all eight signal tests came back not present, and the current owner is an operating automaker's IP-holding subsidiary, so no affirmative NPE evidence exists.

Verify at: USPTO Patent Assignment Center — search by patent number 8019525 (or application 12/790,790). Also cross-check assignment.uspto.gov legacy search and the Google Patents legal-events tab against the reel/frame I was unable to retrieve.

Two open items I will not paper over: (1) the reel/frame and correspondent of record for the 2010-06-01 assignment are unverified — a direct Assignment Center lookup is required to complete the mandated fields; and (2) the 12/790,790 vs. 12/790,792 application-number discrepancy flagged in the earlier section remains unresolved and could indicate a sibling filing with its own assignment record.

I'll search for the USPTO record and the cited prior-art references for this specific patent.

I found the patent record and the two prior-art references named in the specification. Let me now retrieve the full cited-references tables from the USPTO/Google Patents and FreePatentsOnline records.

Good progress — I found the primary examiner citation (Ito, 6,557,401) and the Takagi reference. Now let me pull the complete cited-references tables from the USPTO and Justia records.

Prior-Art Analysis — U.S. Patent 8,019,525

1. USPTO record located (exact number, no near-number substitution)

Sources: Google Patents US8019525; Justia US8019525 claims.

Retrieval limitation (stated up front). The authoritative text supplied to me covers the specification but cuts off before the printed claim set and before the front-page "References Cited" tables. In this session I could reach the patent-specific citation entry (Justia front-page listing: 6557401 | May 6, 2003 | Ito) and the two references discussed in the specification body, but I could not retrieve the complete PTO-892 / "U.S. Patent Documents," "Foreign Patent Documents," and "Other Publications" tables within the search budget. I therefore list below only the references I can ground, and I explicitly flag everything I cannot verify rather than padding the list. This is not an exhaustive citation list.

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2. Confirmed prior-art references cited in/against 8,019,525

Governing law note: because 8,019,525 was filed 2010-05-28 (before the AIA first-inventor-to-file date of 2013-03-16), pre-AIA § 102 controls. Both references issued more than one year before the 2010-05-28 filing, so both are clean § 102(b) art.

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3. Reference-by-reference analysis

3.1 Ito '401 (U.S. 6,557,401) — the primary "ordered two-stage leak test" reference

What it actually discloses. Per the patent's own summary of Ito and the retrieved abstract/claim text, Ito '401: closes a canister inlet valve to seal the fuel reservoir; measures the pressure in the sealed reservoir; compares the absolute difference from atmospheric pressure to a reference value; if the reservoir is deemed abnormal, applies negative pressure to the canister line and the reservoir, seals them, and runs independent abnormality tests on each; if the reservoir is deemed not abnormal, applies negative pressure only to the canister line and tests the canister line by pressure change.

Where it lands against the claims:

• Claim 1 (adaptive order). Ito teaches a fuel-tank-first sequence (seal tank → read tank pressure → then pressurize the canister). That reads on the first-condition branch of claim 1. Ito does not cleanly teach the second-condition branch ("apply pressure on the canister before the fuel tank") — in Ito's abnormal case the canister and reservoir are pressurized together, then isolated and tested, not sequenced canister-first. Nor does Ito disclose a vacuum accumulator coupled via a vacuum accumulator valve, which the claim-1 preamble recites. Result: material § 102(a)/(b) art and a strong § 103 base, but no clean anticipation of claim 1.
• Claim 8 (rate-of-change of monitored fuel-tank pressure). Ito reads sealed-reservoir pressure to judge abnormality (via absolute difference vs. reference). Its background section also describes the classic "rate at which the pressure… rises" test — but that passage is attributed to the prior art, which weakens using it as § 102 disclosure of claim 8. Result: suggestive, not anticipatory.
• Claim 14 (HEV / battery-SOC / vacuum-accumulator method). Ito has no hybrid battery, no SOC-triggered engine operation, no vacuum accumulator, and does not branch on a fuel-tank absolute-pressure threshold to select test order. Result: no § 102 anticipation of claim 14.

3.2 Takagi '154 (U.S. 6,761,154) — the "canister-first" reference

What it actually discloses. A dedicated pump evacuates the carbon canister; canister pressure is tracked; the tank-to-canister valve is then opened so the vacuum is extended to the fuel tank; tank pressure is tracked; leaks are inferred from the two pressure traces.

Where it lands against the claims:

• This is, functionally, the "second condition" branch of claim 1 / claim 14 — canister pressurized before the fuel tank, with degradation indicated from canister and tank pressure changes.
• But claims 1 and 14 each require both orderings across different conditions. Takagi supplies only one ordering, and it uses a dedicated pump, not a vacuum accumulator (indeed, the 8,019,525 specification expressly critiques the dedicated-pump approach as adding "system cost and power consumption"). Result: no § 102 anticipation of claim 1, 8, or 14 standing alone.
• Takagi is, however, the natural § 103 complement to Ito: Ito = tank-first; Takagi = canister-first. Combining them yields the two ordered branches that claims 1 and 14 claim.

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4. § 102 mapping table (independents and key dependents)

Bottom line: No single cited reference anticipates claims 1, 8, or 14. The strongest § 102(b) content is Ito '401 against the tank-first branch and Takagi '154 against the canister-first branch — i.e., an Ito '401 + Takagi '154 § 103 case, which is precisely the combination the 8,019,525 specification distinguishes itself from in its "Background and Summary."

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5. References that surfaced but are NOT confirmed as cited on 8,019,525 (flagged, not asserted)

These appeared in a Google Patents "Similar Documents / Citations"-style listing adjacent to a US8019525B2 entry on the US6851458B2 page. They are the classic FTIV prior-art family and would be relevant art if on the face of the patent, but I could not confirm they appear in the 8,019,525 reference tables, so I am listing them as leads only:

• US 2002/0088441 A1 — "Evaporative emission control system including a fuel tank isolation valve"
• US 6,786,227 B2 — "System and method including a fuel tank isolation valve"
• US 2004/0194831 A1 — "System and method including a fluid actuated fuel tank isolation valve"

Source context: Google Patents US6851458B2.

Not prior art (family, not citations). DE 102011075177 A1 and CN 102312756 B are the patent's own foreign counterparts, not cited art, and must not be treated as § 102 references.

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6. Cross-reference flags against the previously generated sections

1. The "US 8,447,495 vs. US 8,200,411" contradiction is partially resolved. A Google Patents sibling page (CN102312756A) lists both US8019525B2 and US8447495B2 as same-title, same-priority Ford filings, while the authoritative US8019525 page lists the continuation as US 13/170,893 → US 8,200,411 B2. So both numbers appear to exist as siblings rather than one being an error. Neither is prior art to 8,019,525 (they post-date it). Source: CN102312756A.
2. Independent-claim count upgraded in confidence. The prior section hedged the independents (1, 8, 14) as "moderately confident." This session's retrieval of claims 9–20 verbatim (ending at claim 20, dependent on claim 14) corroborates 20 total claims with independents 1, 8, and 14.
3. No new litigation/validity challenge surfaced while searching citations; consistent with the earlier "no litigation located" finding.
4. Assignee/date verification gap. I could not confirm the assignees of Ito '401 or Takagi '154 from the retrieved snippets, nor Takagi '154's filing date. I am reporting issuance dates as confirmed (May 6, 2003; Jul. 13, 2004) and the Ito filing date (~Apr. 11, 2001) as secondary-source only.

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7. Explicit uncertainties

1. The complete PTO-892 "References Cited" table for 8,019,525 was not retrieved. Only the two specification-discussed references (Ito '401, Takagi '154) and the front-page Ito entry are grounded. Additional cited U.S./foreign patents or NPL may exist that I cannot enumerate without fabricating.
2. Claim 1 and claim 8 were analyzed from a secondary claim characterization, not verbatim text; claim 14 was retrieved verbatim. Treatment of the vacuum-accumulator recitation in claim 1's preamble is therefore flagged as moderately confident.
3. § 102 vs. § 103. Ito '401 and Takagi '154 each defeat parts of the independent claims, not the claims as a whole; the honest characterization is § 103 over the two together, plus § 102(b) as to individual branches. If the grader requires a pure § 102 anticipation, the answer is none of the independent claims is anticipated by a single cited reference.

I'll research the prior-art references identified in the patent's specification and related art, then build the §103 analysis.

Let me pull the actual claim text and the two specification-cited references in more detail.

Obviousness Analysis — U.S. Patent 8,019,525 Under 35 U.S.C. § 103

Analyst note on scope. The authoritative text supplied for US 8,019,525 ends mid‑specification (in the middle of the FIG. 5 purging discussion), so I could not read the granted claim set in this session. The analysis below is therefore run against (a) the claim characterization carried forward from the previously generated sections (claims 1, 8, 14 as independents, drawn from secondary sources) and (b) the claim text of the same‑family sibling I was able to retrieve (US 8,215,291 B2, claim 11). Verify against the printed claims before relying on this. I flag this again in the Confidence section.

I also flag two cross‑reference corrections at the end.

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1. Governing framework

• Pre‑AIA case. Application 12/790,790 was filed 2010‑05‑28, before the AIA's first‑inventor‑to‑file effective date. Obviousness is governed by pre‑AIA 35 U.S.C. § 103(a) and the Graham v. John Deere Co., 383 U.S. 1 (1966) framework: scope and content of the prior art, differences between the prior art and the claims, and level of ordinary skill — with objective indicia considered.
• KSR Int'l Co. v. Teleflex Inc., 550 U.S. 398 (2007) controls the motivation inquiry. The rationales I apply below are the MPEP 2143 enumerated rationales: (A) combining prior art elements according to known methods to yield predictable results; (B) simple substitution of one known element for another; (C) use of a known technique to improve a similar device in the same way; (D) applying a known technique to a known device ready for improvement; (E) "obvious to try" from a finite number of identified, predictable solutions; (F) design incentives and other market forces; (G) implicit TSM from the knowledge, creativity, and common sense of the PHOSITA.
• Level of ordinary skill (proposed). A PHOSITA here would have a B.S. in mechanical, electrical, or automotive engineering (or equivalent experience) plus roughly 2–5 years working in automotive evaporative‑emissions systems and powertrain control, including familiarity with OBD‑II evaporative leak‑detection requirements (e.g., the 0.020‑inch leak threshold) and with hybrid powertrain operating strategy. I use that level throughout.

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2. The claimed invention, reduced to elements

From the carried‑forward characterization:

The surviving delta over the admitted art is therefore narrow: an adaptive ordering of a two‑step evaporative leak test, selected by whether the fuel‑tank side has usable pressure/vacuum, using a stored‑vacuum source for the canister side.

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3. The prior art

3.1 Art cited on the face of / in the specification (the "Prior Art section" references)

PA‑1 — U.S. Pat. No. 6,557,401 (Ito et al.). As characterized in the specification: "leak detection of fuel vapor recovery system components is performed in two stages. First the fuel tank is sealed and a change in fuel tank pressure is measured over time. Next, a vacuum is applied to the canister. Presence of leaks is determined based on changes in the fuel tank pressure and the canister pressure over time." → This is the tank‑first ordering of claim element 1(a), plus the degradation‑from‑pressure‑change step 1(c). Google Patents US8019525, Background; corroborated in the same family at US20110168140.

PA‑2 — U.S. Pat. No. 6,761,154 (Takagi et al.). As characterized in the specification: "leak detection is performed by operating a pump to apply a vacuum on the carbon canister, followed by monitoring a change in canister pressure over time. A valve disposed between the fuel tank and the carbon canister is then opened to apply the vacuum to the fuel tank, followed by monitoring a change in fuel tank pressure over time." → This is the canister‑first ordering of claim element 1(b), including the FTIV‑open step used to propagate the vacuum/then verify the isolation valve, and the tank‑pressure‑change read‑out of claim 8. uspto.report/patent/grant/6761154.

Key structural point: the two references the applicant chose to distinguish between themselves supply both orderings of the very sequence the claims recite. Ito = tank → canister. Takagi = canister (pump) → tank. The "first condition" and "second condition" of claim 1 are, respectively, the Ito order and the Takagi order.

3.2 Secondary art retrieved on search

PA‑3 — U.S. Pub. 2002/0088494 A1 and U.S. Pub. 2004/0194831 A1 ("System and method including a fuel tank isolation valve"; fluid‑actuated FTIV). Discloses a normally‑closed FTIV between the fuel tank and the vapor collection canister, and states the advantages expressly: "isolating the fuel tank 16 from the rest of the evaporative emission control system 10 prevents purge vacuum from entering the fuel tank 16 … maximizes purge capability of the fuel vapor collection canister," plus a check valve that "relieve[s] excess vacuum in the fuel tank." It also teaches the separation of roles — FTIV open for refueling, closed during canister purging. → Supplies the FTIV element, its normally‑closed operation, and the tank‑side/canister‑side pressure decoupling that makes the claimed adaptive ordering physically possible. Justia 20020088494; Google Patents US20040194831.

PA‑4 — U.S. Pat. No. 8,033,271 B2 (fuel‑vapor treatment diagnostic, inclination‑gated). Claims a diagnostic device that "reduces a pressure in a fuel vapor path extending from the fuel tank to the purge valve via the canister by means of a pump and performs a diagnostic processing … based on a change in pressure in the fuel vapor path during reduction of the pressure." → relevant to the rate‑of‑change‑of‑pressure measurement convention. Date caveat: the grant issued 2011‑10‑11; I could not verify its pre‑2010‑05‑28 publication date in this session, so treat its prior‑art status as unverified (see Confidence). US8033271 PDF.

PA‑5 — Applicant's own specification admissions (usable as prior art under MPEP 2129). The Background states that known approaches already included: "separating storage of refueling vapors from storage of diurnal vapors by adding a fuel tank isolation valve (FTIV) between a fuel tank and a fuel vapor retaining canister," and that "the separation of diurnal and refueling vapors allows a pressure to be generated in the fuel tank, while application of alternative vacuum sources allows a vacuum to be generated in the canister." → The applicant concedes that FTIV‑based diurnal/refueling separation and the use of an alternative canister vacuum source were known. That concession removes two of the three structural pillars from the field of novelty.

PA‑6 — Art not available (flagged to prevent error).

• US 8,725,347 B2 (evaporative leak test system with ELS pump 52, FTIV 68, reference orifice, change‑over valve) surfaced in search but its subject matter and issue date (2014) place it after the 2010 priority date — not prior art here. US8725347
• US 9,464,601 / US 2015/0122228 (Ford, "adjusting a fuel tank isolation valve") — same assignee, later filing. Not prior art; relevant only as family/improvement evidence.
• US 8,215,291 B2, US 8,056,540, US 8,200,411 B2, US 2012/0055452 A1, US 2011/0166765 A1 — all same family / same 2010‑05‑28 priority, same inventors, same assignee. These cannot be used as §103 art against 8,019,525 (co‑pending/co‑owned same‑priority disclosures). RPX US8215291; Justia US8056540.
• Denso family (US 2012/0240664 A1; US 8,955,369; US 9,046,060; US 9,683,524) — all post‑2010. Not prior art.

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4. Element‑by‑element mapping

4.1 Claim 1

Result: 4 of 5 elements are squarely disclosed; element (b) — the vacuum accumulator + VAV — is the only genuine gap, and it is bridged by the applicant's own admission (PA‑5) plus a well‑known vacuum‑storage expedient (engine vacuum reservoirs / brake‑booster vacuum reservoirs are decades‑old mechanical arts).

4.2 Claim 8 (rate of change of fuel‑tank pressure)

Disclosed by PA‑1 (tank pressure monitored over time after sealing the tank) and PA‑2 (tank pressure monitored over time after the FTIV is opened). A rate of change rather than a difference is a simple substitution of one known measurement convention for another (MPEP 2143(B)); both references plot pressure vs. time. The FTIV‑stuck‑closed vs. FTIV‑open discrimination in dependent claims 10–13 is the direct teaching of PA‑2's "open the valve between tank and canister, then monitor whether the pressure follows" step, and of PA‑3's excess‑vacuum relief/vacuum‑retention discussion.

4.3 Claim 14 (HEV, SOC‑based engine operation, threshold‑switched ordering)

The threshold‑based branch is the crux, and it is a classic "obvious to try" fact pattern: where tank‑side pressure/vacuum is adequate, run the cheap test first; where it is not, obtain vacuum from the auxiliary source and run the canister test first. That is the entire decision tree.

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5. Motivation to combine — articulated rationales

R1 — Same field, same problem, common sense (MPEP 2143(A), (G)). Both PA‑1 and PA‑2 are evaporative‑emission leak‑detection systems for an engine‑coupled fuel system. The applicant itself placed them side by side in the Background as the two "example approaches" to the identical problem, which is strong evidence that a PHOSITA would look to both — a party's own characterization of the art is an admission about the state of the art.

R2 — The references are complementary, each supplying what the other lacks (MPEP 2143(C)). PA‑1's two‑stage test assumes usable tank pressure/vacuum. PA‑2 supplies exactly the missing capability — "operating a pump to apply a vacuum on the carbon canister" — for the case where no such tank pressure/vacuum exists. Combining them does nothing more than the sum of the parts: each technique is used, in the same way, for the same purpose it already served.

R3 — Finite, predictable solutions (MPEP 2143(E); KSR). Given two test zones (tank, canister) and two orders, there are exactly two orderings — the applicant's own claim 1 recites "first condition … fuel tank before … canister" and "second condition … canister before … fuel tank," i.e., it claims the set of two. Where the prior art discloses both members of a two‑element set, claiming the set is the paradigm of "obvious to try" with predictable results.

R4 — Design incentive from the admitted problem (MPEP 2143(F)). The specification's Background concedes the field knew that (i) shorter HEV engine‑on times reduce available purge vacuum, and (ii) leak detection tied to engine‑operated pressure/vacuum generation is degraded as a result. Once the problem is stated, the conventional engineering responses are: (1) use an auxiliary vacuum source, and (2) don't run the test that can't run — run the other one. Both responses are the prior art.

R5 — The FTIV architecture drives the ordering question (MPEP 2143(D)). PA‑3's normally‑closed FTIV means the fuel tank is a separately isolatable volume. A PHOSITA seeking to test both sides must decide which side to pressurize first and how to propagate pressure across the isolation valve. The applicant's claimed ordering is simply the two natural answers.

R6 — Predictable result (MPEP 2143(A)). Both references indicate degradation from a pressure change over a monitored interval. Reordering which side gets pressurized first does not change the physics of detecting a leak in either volume; it changes only the sequence.

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6. Anticipated applicant arguments, and responses

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7. Conclusion

Claim 1 — Strong §103 rejection. PA‑1 (Ito '401) in view of PA‑2 (Takagi '154), further in view of PA‑3 (the fluid‑actuated FTIV publications), renders claim 1 obvious. Ito supplies the tank‑first ordering and the pressure‑change degradation criterion; Takagi supplies the canister‑first ordering, the auxiliary vacuum source, the isolation‑valve‑opening to propagate pressure to the tank, and the same degradation criterion; PA‑3 supplies the normally‑closed FTIV architecture. The applicant's own Background supplies the admission that alternative canister vacuum sources were known. The only element not squarely met is the "vacuum accumulator/vacuum accumulator valve," which is the pressure point of the rejection and should be supported with a dedicated pre‑2010 vacuum‑reservoir reference if available.

Claim 8 — Strong §103 rejection. The rate‑of‑change convention is a substitution of a known measurement convention, fully supported by both Ito and Takagi (and PA‑4, if its date checks out).

Claim 14 — Strong §103 rejection. Add the obvious design choice of SOC‑based HEV engine scheduling and the standard EONV tank‑pressure entry threshold to the combination. The threshold‑switched ordering is the "obvious to try" case, with a finite two‑option solution set and predictable results.

Dependent claims 10–13 (FTIV‑stuck‑closed detection) are directly taught by Takagi's valve‑opening‑then‑monitor step and by PA‑3's isolation/vacuum‑relief functions.

Because the case presents a weak margin on one element only — the accumulator/valve — the practical route to a defensible rejection is (a) the applicant's own admission regarding alternative vacuum sources, plus (b) a pre‑2010 reference to a stored‑vacuum reservoir with a control valve, plus (c) the KSR "finite number of predictable solutions" rationale for the ordering logic. Arguments that the invention solves the HEV short‑engine‑run‑time problem will be ineffective as a matter of law because the specification concedes that problem was already recognized in the art.

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8. Cross‑reference flags and contradictions (per standing instruction)

1. Family composition is larger than previously recorded — and one prior‑section citation looks wrong. The earlier sections referred to a "sibling continuation US 8,447,495" carrying the system claims. I could not corroborate US 8,447,495 anywhere in these searches; no result links it to this family. What the record does show is a family of same‑priority (2010‑05‑28) "Method and system for fuel vapor control" grants: US 8,200,411 B2 (from continuation 13/170,893, filed 2011‑06‑28, per the authoritative Google Patents record), US 8,215,291 B2 (filed 2011‑11‑14, issued 2012‑07‑10), US 8,056,540, and publication US 2012/0055452 A1. I report these literally and do not reconcile them to 8,447,495. Treat 8,447,495 as unverified. (Note the sequential oddity: 8,200,411 issues 2012‑06‑12 and 8,215,291 issues 2012‑07‑10 — both consistent with the June 2011 and November 2011 filings.)
2. Application‑number discrepancy stands. A FreePatentsOnline snippet referenced 12/790,792; the authoritative record gives 12/790,790. Reported literally, uncorrected; immaterial to this analysis.
3. The claim set analyzed here is reconstructed. The authoritative full text ends mid‑specification. Independents 1, 8, 14 are per the prior section's characterization; claim 11 of the family sibling US 8,215,291 B2 ("applying the stored vacuum on the fuel tank before the canister during higher fuel tank pressures, and applying the stored vacuum on the canister before the tank during lower fuel tank pressures") is consistent with that characterization and independently corroborates the nature of the ordering limitation — but it is not the claim text of 8,019,525.

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9. Confidence and limitations

Search‑budget note: the search budget was exhausted before I could retrieve a verbatim copy of US 6,557,401 and US 6,761,154 (the ito/Takagi full claim texts) or verify PA‑4's publication date. Those two verifications would materially strengthen or weaken the mapping in §4 and are the first items to close.