US 5012780

I'll search for this specific patent number across sources.

US 5,012,780 — Verified Record

I searched for the specific number 5012780 as instructed. Below is what the sources actually say. Note: a search for "5,012,780" also surfaced results for different patents — U.S. 10,601,780 (Croga Innovations) and U.S. 5,424,780 (New Medium v. Barco) — which I have not conflated with this patent.

Bibliographic data

Sources: Google Patents US5012780A, Justia, OSTI 5065035 (independently confirms assignee "Coltec Industries Inc., New York, NY" and file date 5 Jan 1990), everypatent.

Foreign family: JP 2,341,224 (JPH03225055A, filed 1990‑11‑30) and IT 02257290 (IT1246757B, filed 1990‑12‑28) — both list the same 1990‑01‑05 US priority date.

Later assignments: Google's assignment reel shows the patent passing from Coltec to Holley Performance Products, Inc. (recorded 1998‑08‑24 and again 2000‑02‑24), with multiple security interests recorded by Bankers Trust, Crédit Agricole Indosuez, Fleet Capital Corporation, Foothill/Wells Fargo Foothill, and U.S. Bank National Association. Google's "Current Assignee" field lists Fleet Capital Corp, but that entry sits in a chain of security interest records, so I would not treat it as an operating owner — and Google itself disclaims accuracy of listed assignees. Treat current ownership as uncertain without a live Patent Center assignment lookup.

Abstract (verbatim from the patent)

"An electronic fuel injection system operable as a bolt on retro fit replacement for a wide variety of carburetors is disclosed. The system includes a throttle body-injector assembly which, by means of an adapter may be bolted directly to stock intake manifolds using the carburetor mounting bolt holes in the manifold. The throttle body passages and injectors are designed to meet the fuel and air delivery requirements of large displacement engines and an electronic control unit which controls the solenoid actuated injectors in a duty cycle operation is provided with externally accessible adjustments by means of which the system may be adjusted to tune the rate of fuel injection to the fuel delivery requirements of engines of displacements much smaller than the largest displacement engine within the systems capability. The system may be independently adjusted for optimum or user selected economy or power operation at idle, mid range and high rpm engine operation and further includes choke and accelerating enrichment adjustments. The control unit also controls operation of the fuel pump to maintain a constant injection pressure at all times."

Overview of the independent claims (plain language)

Claim 1 — Stand-alone throttle-body EFI with a tunable accelerator-pump input. A self-contained throttle-body injection system whose electronic control unit (a) generates a pulse-width-modulated (PWM) drive signal for the injectors, (b) sets the signal frequency from engine RPM, (c) sets the pulse width from throttle position, and (d) includes an "accelerator pump" adjustment responsive to a full-open throttle sensor that feeds both the pulse-width generator and the frequency generator, so a tip-in simultaneously widens the pulse and raises the injection frequency.

Claim 2 — System-level bolt-on retrofit combination. An engine fuel system combining: a throttle body with an air passage and a throttle; an adapter mounting the body on the manifold with the passage outlet opening into the manifold inlet; cyclic (pulsed) fuel injectors on the body; a fuel pump feeding the injectors from the tank; a control unit with throttle-position and engine-speed sensing that varies both pulse duration and pulse frequency; plus manually operable adjustment means for establishing independently selected air/fuel ratios at idle, mid-range, and high speed.

Claim 3 — Stand-alone EFI with three separate mixture adjustments. Same PWM/frequency/pulse-width architecture as claim 1, but the distinguishing feature is a trio of adjustments: a first (idle) adjustment setting a base idle pulse width, a second (mid-range) adjustment responsive to the throttle position sensor at mid-range RPM, and a third adjustment trimming pulse width under high-RPM operating conditions.

Claim 6 — Retrofit system with a coolant-heated adapter plate. Same combination as claim 2, but the adapter is positively recited as a plate-like member bolted and sealed over the manifold inlet, with a first passage continuing the throttle-body air passage and a second passage for circulating engine coolant through the plate (anti-icing).

Claim 10 — Stand-alone EFI with user-tunable mixture over three regimes. Structurally parallel to claim 1 (PWM generation, RPM-based frequency, throttle-position-based pulse width, throttle position sensor, RPM signal), but reciting manually operable adjustment means establishing independently selected air/fuel ratios at idle, mid-range and high RPM, at least responsive to the throttle position sensor at mid-range conditions.

Dependent claims, briefly

• 4 (dep. 3) — adapter plate with coolant passage; 5 (dep. 4) — adapter in the engine compartment, control unit mounted in the vehicle isolated from the engine compartment.
• 7 (dep. 6) — two vertical air passages, two injectors coaxially above them, pressure regulator with a constant-pressure fuel chamber common to both injector inlets; 8 (dep. 7) — pump commanded to over-supply, pressure-responsive valve returns excess to tank; 9 (dep. 7) — solenoid valves driven by a first PWM signal plus a second electrical signal controlling the pump to hold constant inlet pressure.
• 11, 12 (dep. 10) — idle adjustment for base idle pulse width; frequency generator is a voltage-controlled oscillator.
• 13 (dep. 10) — coolant-circulating adapter plate.
• 14–18 (dep. 10) — throttle position sensor + RPM signal means; mid-range adjustment; high-RPM adjustment; fuel-pump speed varied in proportion to RPM in response to the ignition switch, TPS and RPM; and (claim 18) a fast-idle solenoid driver, coolant temperature sensor, and temperature adjustment. Note: the claim-18 text is truncated in the source at "for adjusting the pulse" — the full closing limitation is not recoverable from the retrieved text.

Prior-art references cited on the face of the patent (7)

US 4,096,831 (Gunda, Bendix); US 4,212,277 (Melotti, Bendix); US 4,341,193 (Bowler, GM); US 4,347,823 (Kessler et al., GM); US 4,372,271 (Elpern et al., Bendix); US 4,705,001 (Danno et al., Mitsubishi); US 4,827,897 (Yamada et al., Nippondenso). The specification additionally incorporates-by-reference U.S. 4,708,117 for injector construction and duty-cycle operation.

The patent is itself cited by, among others, US 5,261,382 (Coltec / Nikolai, 1993), which expressly describes adding oxygen-sensor closed-loop feedback to "the fuel control system of said U.S. Pat. No. 5,012,780," and by numerous later Holley Performance Products throttle-body patents.

CAFC 2026 docket and litigation search

No CAFC 2026 docket activity was found for 5,012,780, and I found no district-court or PTAB proceeding asserting or challenging this patent. Targeted searches returned no hits for this number in appellate docket indices. Given that the patent is recorded as expired (anticipated expiration January 5, 2010) and expired for non-payment of maintenance fees, active 2026 appellate litigation is implausible on its face. I cannot rule out an unpublished or non-indexed docket entry, and I did not obtain live USPTO Patent Center / PACER/CM-ECF output — so treat the absence of litigation as a negative finding from my searches, not an affirmative certification.

Explicit uncertainties

1. Current owner — assignment records show Coltec → Holley plus a long chain of secured-party interests; Google's "Fleet Capital Corp" current-assignee listing appears to be a collateral agent, not necessarily an owner.
2. Claim 18 text — truncated in every retrieved copy.
3. Expiration — both the patent's own text (17-year pre-URAA term from issue, i.e., 2008) and Google's "20 years from filing" figure (2010‑01‑05) appear in the record; Google's status line says expired, which is consistent either way.
4. Figures 1–6 are image-only in the sources; my summaries of the drawings' content rely on the written description.

I'll search for litigation involving US patent 5012780.

Let me try more targeted searches on litigation databases.

Let me dig deeper with more specific queries.

Litigation Search — U.S. Patent No. 5,012,780

Bottom line: I found no litigation — no district court action, ITC investigation, or Federal Circuit appeal — in which U.S. Patent No. 5,012,780 was asserted or adjudicated. Based on the searches I was able to run, there is no known litigation involving this patent.

What I searched

• General web/patent-litigation queries for "5012780 patent litigation lawsuit infringement" — returned zero results.
• "5012780" combined with Unified Patents Portal, docket/CAFC/PACER-style sources — no litigation hits.
• Holley Performance Products / Coltec Industries fuel-injection patent litigation queries (Holley is the current owner of the '780 patent per the assignment record).

I was not able to query PACER, the Unified Patents litigation caselist, or CourtListener/Docket Alarm directly within the available search steps; my results are therefore not a certified exhaustive clearance search, and I flag that limitation explicitly rather than overstate the negative.

Why the absence of litigation is plausible

A patent that issued in 1991, was terminally expired for failure to pay maintenance fees, and covered a niche retrofit throttle-body EFI retrofit product has a relatively narrow effective enforcement window. Holley — its eventual owner — has instead litigated later-generation EFI throttle-body patents (see below).

Related-but-not-relevant hits (disambiguation)

The following surfaced in searches and are different patents with coincidentally similar numbering. I report them only so they are not mistaken for the '780 patent:

Citations to note (prior art, not litigation)

Per the patent's front page, the examiner cited seven references, including US 4,708,117, which the specification expressly incorporates for injector/duty-cycle details; other cited references include US 4,096,831; US 4,212,277; US 4,341,193; US 4,347,823; US 4,705,001; and US 4,827,897. These are prior-art citations, not evidence of litigation.
Source: https://patents.google.com/patent/US5012780/en

Recommendations before you rely on this as a negative

1. Run the exact string 5,012,780 (and 5012780, 5:01-cv- style docket patterns) against PACER (all districts), Unified Patents Portal litigation caselist, and CourtListener/RECAP.
2. Search the ITC EDIS database and the CAFC docket for any appeal referencing the patent.
3. Check USPTO Patent Trial and Appeal Board (IPR/PGR/CBM) — I found no PTAB proceedings either, but the PTAB is a non-Article III forum and would not appear as "litigation."
4. Cross-check the assignment chain (Coltec → Bankers Trust → Holley → Fleet Capital) for any license or covenant that would explain the absence of suits.

Caveat: I did not identify any case asserting US 5,012,780, and I am not asserting that none exists — only that none appeared in the sources and queries available to me. I reached the search-step limit before exhausting all litigation databases, so a confirmatory PACER/Unified Portal check is advised before relying on this as a formal freedom-to-operate or clearance conclusion.

PTAB proceedings overview

Total AIA trial proceedings on US 5,012,780: zero. The USPTO Open Data Portal structured block reports no AIA trial proceedings for this patent, and independent web searching surfaced no IPR, PGR, or CBM petition naming the '780 patent. The breakdown is therefore 0 active / 0 claims invalidated / 0 claims sustained / 0 settled / 0 institution denials — meaning there is no PTAB validity ruling to hand a defendant, good or bad. The more important defensive fact, though, is one level up: the '780 patent is expired, so it cannot be asserted against anyone today, and the absence of PTAB activity is explained by that rather than by the patent going unchallenged.

No proceedings to itemize

There is no {PROCEEDING_NUMBER} — {Petitioner} v. {Patent Owner} entry to report. Per the task's constraint against inventing proceeding numbers, I am not supplying any. What I can document is the negative result and the surrounding record:

• Searches run: "US 5012780 IPR PTAB", "5,012,780" patent PTAB proceeding, "5012780" Coltec Holley validity challenge, and "5,012,780" OR "5012780" inter partes review petition. All returned either zero results or hits on unrelated patents that merely share the "780" suffix (e.g., IPR2025-00380 on U.S. 10,601,780; IPR2025-0134 on U.S. 10,650,780). Those "780" results are not this patent and should not be conflated with it.
• Why the record is thin: US 5,012,780 issued 1991-05-07 to Coltec Industries Inc. (inventor Ralph Bugamelli) and, per the Google Patents bibliographic record, reached its anticipated expiration on 2010-01-05, with a legal status of "Expired - Fee Related." A patent whose term ended before the AIA's IPR/PGR/CBM regimes matured is a poor candidate for AIA trial activity — petitioners generally do not spend IPR filing fees on a patent with no remaining term to clear.
• Assignment history (context, not a proceeding): the file shows a chain from Coltec to Holley Performance Products Inc. (1998) and a series of security interests (Bankers Trust, Crédit Agricole, Fleet Capital, Foothill, U.S. Bank, Wells Fargo Foothill) through 2008. None of these are validity challenges; they are liens and assignments. Post-2010 entries are releases of security interests.

Strategic summary

Claim status. Because no AIA trial ever issued a Final Written Decision on US 5,012,780, the claim-level picture is simply the patent as granted: claims 1–18 were never canceled, never confirmed, and never construed by the Board. There is no "claims 1–5 canceled" outcome to leverage, and equally no adverse PTAB ruling that a patent owner would have to work around. The claims are untested before the PTAB — but that is academic, because the patent's term expired 2010-01-05. An expired patent cannot ground an infringement claim, so the practical category for every claim is "expired," which defeats assertion more completely than any IPR cancellation would.

Estoppel landscape. There is no § 315(e)(2) estoppel to map, because there was no petitioner and no institution. For a defendant being threatened today (or more likely, a defendant whose demand letter cites the '780 patent in error), the estoppel question is moot: your defense is not "the Board already invalidated this" but "the patent is expired and unenforceable as to any post-2010 conduct." If a plaintiff is somehow asserting the '780 patent, that is a threshold defect to raise immediately; if the demand letter is citing some other patent and the '780 number is a transcription error, get the correct number before doing any invalidity work.

Pattern signals. No repeat-petitioner pattern, no patent-owner PTAB appeal history, and no defensive aggregator (Unified Patents or similar) activity is visible for this patent. The patent's own forward-citation trail is dominated by Coltec's continuation US 5,261,382 ("Fuel injection system," 1993) and by much later Holley/Edelbrock/Kohler/Fuel Injection Technology throttle-body filings — evidence that the technology stayed commercially relevant, not that the patent was litigated. If you want confirmation beyond the ODP ingest, the authoritative sources to check are the USPTO PTAB E2E / Patent Trial and Appeal Board End-to-End system and the patent's USPTO PatentCenter record, neither of which I can query live from here.

Recommended next steps

1. Verify asserted status before spending anything. Confirm whether the '780 patent is actually being asserted. Its term ended 2010-01-05 (20 years from the 1990-01-05 filing; longer than the 17-years-from-grant alternative of 2008-05-07), so absent extraordinary circumstances there is no live infringement theory against current conduct. Cite the patent's expiration date and status if a demand letter references it.
2. If a demand letter cites "5,012,780," treat it as a probable citation error. Check the actual number on the face of the letter against PatentCenter. A well-asserted patent in this family today would more likely be one of the Holley throttle-body patents (e.g., US 10,012,197 or the '069 publication family) or a Fuel Injection Technology patent — all of which do have PTAB activity elsewhere and would need their own proceeding analysis.
3. No PTAB milestones to calendar. There is no institution-decision deadline, no oral hearing, and no statutory one-year FWD due date to track, because no petition exists.
4. State the negative plainly in any opinion. "No AIA trial proceeding has ever been filed on US 5,012,780" is the accurate answer. The absence is a signal here — but the signal is expiration and age, not stealth litigation strength. Do not represent the silence as "the patent owner has never been challenged and therefore the claims are strong"; nothing in the record supports that inference.

Confidence note: I have high confidence in the negative PTAB result based on the ODP structured block plus independent searching. I could not retrieve the patent's PatentCenter prosecution file or any ex parte reexamination record, so I cannot rule out a non-AIA post-grant challenge (e.g., an ex parte reexamination) affecting claims — that would not appear in the AIA-trial data above, and if it matters to your matter, it should be confirmed in PatentCenter.

I'll start by pulling the authoritative assignment/legal-event data and cross-referencing the corporate history.

I have the reel/frame data now. Let me check for any assertion/enforcement history and defensive-aggregator involvement.

Ownership Reconstruction — US 5,012,780 ("Stand alone fuel injection system")

Data caveat up front. I was able to retrieve the reel/frame identifiers for this patent from the Google Patents legal-events rendering (which mirrors the USPTO assignment index), but I was not able to retrieve the correspondent-of-record field for any instrument. The Assignment Center / Google Patents legal-event output does not surface the filing attorney, and I did not obtain a live Assignment Center record page in this session. Section 3 of the NPE signals below is therefore marked unclear, not "not present." I also did not obtain a live fetch of https://assignmentcenter.uspto.gov/ to confirm the record is complete — the timeline below reflects the recorded instruments visible in the legal-events set.

Inventors

Pattern notes:

• The inventor assigned ~11 months after filing, which is unremarkable for a corporate employee-inventor at a large diversified manufacturer.
• Bugamelli appears exactly once in the entire recorded chain — as assignor on Reel 005581/0743. He never appears again as assignor, assignee, or party to any later instrument. There is no evidence in the record of inventor departure (as the prompt's example contemplates); the more accurate statement is simply that he has no further recorded footprint. I did not find any employment/HR records to test the departure hypothesis.
• The patent is a sibling of US 5,261,382 ("Fuel injection system," filed 1992-09-22, issued 1993-11-16, assigned to Coltec Industries Inc.), suggesting this was a multi-patent throttle-body EFI program inside Coltec/Holley, not a one-off filing.

Original assignee

Coltec Industries Inc. — 430 Park Avenue, New York, NY (per Reel 005581/0743). Coltec was the renamed Colt Industries (the 1968 merger partner of Holley), a diversified industrial holding company that by the 1990s reported ~$1.31B in 1997 sales across aerospace and industrial seals/nozzles/landing gear, with automotive parts (Holley) as a legacy segment.

• Did they ship a product embodying the claims? Almost certainly yes through the operating division rather than the parent. The specification describes a two-barrel throttle body flowing up to 670 CFM at 1.5" Hg, with two 80 lb/hr injectors — that figure maps onto Holley's commercially marketed 670 CFM two-barrel throttle-body EFI family. Company histories place Holley's entry into fuel injection in 1985, i.e., ~5 years before this filing. I flag this as strongly indicated but not search-confirmed in this session (I did not locate a product brochure/spec sheet tying the 670 CFM figure to a Holley part number).
• Primary line of business: diversified industrial (aerospace/industrial); the patent's business unit was performance automotive aftermarket.
• Current status: Coltec exited the auto-parts business entirely, agreeing on 1998-04-14/15 to sell Holley Performance Products to a management-led group sponsored by Kohlberg & Co. for $100 million, closing 1998-05-15 ("Coltec Industries Completes Its Move Out of Auto Parts," NYT, 1998-04-15; Coltec 10-K language: "On May 15, 1998 the Company completed its previously announced sale of Holley for $100 million"). Coltec's later corporate fate (reported merger into B.F. Goodrich) was not verified in this session — treat as unconfirmed.

Subsequent owner of the patent — Holley Performance Products, Inc. (Bowling Green, KY): a genuine operating manufacturer that still ships EFI throttle bodies, carburetors, and fuel systems (holley.com; NASDAQ-listed entity lineage). It is not a shell and not on any NPE list. It has, however, been through two Chapter 11 cases (filed prepackaged ~2008-02-11, emerged ~2008-03-28; filed again 2009-09-28, emerged 2010-06-22) and is today an active patent plaintiff — e.g., Holley Performance Products Inc. v. Aces Fuel Injection, Inc., No. 1:26-cv-00059 (E.D. Tenn., filed 2026-03-06), asserted on the '515, '083, '894 and '434 patents (throttle-body EFI), with RPX classifying Holley as "Patent Owner / Operating Company." Note: the '780 patent is not among those asserted — it expired.

Assignment timeline

Reel/frame identifiers sourced from the Google Patents legal-events rendering. "Execution" = USPTO effective/execution date; "recorded" = recordation date. Where an execution date was not exposed, I say so rather than infer one.

• 1990-12-12 (executed) / recorded 1991-02-01 — Reel 005581/0743

  • Conveyance: Assignment of assignors interest
  • Assignor: Bugamelli, Ralph (sole inventor)
  • Assignee: Coltec Industries Inc., 430 Park Avenue, New York, NY
  • Correspondent: not retrievable from available sources (see caveat).
  • Context: Inventor-to-employer assignment of the application.

• 1992-04-01 (executed) / recorded 1992-04-08 — Reel 006080/0224

  • Conveyance: Security Interest
  • Assignor: Coltec Industries Inc.
  • Assignee: Bankers Trust Company, New York
  • Correspondent: not retrievable.
  • Context: Securitization — blanket collateral lien over Coltec's patent estate; not a change of beneficial ownership.

• 1998-05-12 (executed) / recorded 1998-08-24 — Reel 009405/0182

  • Conveyance: Assignment of interest
  • Assignor: Coltec Industries Inc.
  • Assignee: Holley Performance Products Inc., Kentucky
  • Correspondent: not retrievable.
  • Context: Acquisition — the patent moved with the Holley business in the $100M management/Kohlberg buyout (deal closed 1998-05-15). This is the only true sale of the patent in its history.

• 1998-05-15 (executed) / recorded 1998-06-03 — Reel 009197/0852

  • Conveyance: Security Interest
  • Assignor: Holley Performance Products, Inc.
  • Assignee: Credit Agricole Indosuez, as Collateral Agent, New York
  • Correspondent: not retrievable.
  • Context: Securitization — acquisition financing for the buyout, filed three days after the sale instrument.

• (execution date not retrieved) / recorded 2000-02-24 — Reel 010639/0074

  • Conveyance: Assignment of interest
  • Assignor: Coltec Industries, Inc.
  • Assignee: Holley Performance Products (Inc.)
  • Correspondent: not retrievable.
  • Context: Confirmatory / cleanup assignment — a second Coltec→Holley instrument recorded ~21 months after the first, consistent with patents omitted from the original schedule or requiring supplemental documentation. Not a new transaction.

• (execution date not retrieved) / recorded 2001-03-21 — Reel 011641/0166

  • Conveyance: Security Agreement
  • Assignor: Holley Performance Products, Inc.
  • Assignee: Fleet Capital Corporation
  • Correspondent: not retrievable.
  • Context: Securitization.

• (execution date not retrieved) / recorded 2001-03-21 — Reel not captured

  • Conveyance: Security Interest
  • Assignor: Earl's Supply Company
  • Assignee: Fleet Capital Corporation
  • Correspondent: not retrievable.
  • Context: Securitization — same-day companion lien over a sister brand acquired by Holley.

• 2001-05-14 (executed) / recorded 2001-10-12 — Reel 012232/0173

  • Conveyance: Assignment of interest to Fleet Capital Corporation (later terminated as a security interest — see 2002-09-11 below)
  • Assignor: Holley Performance Products, Inc.
  • Assignee: Fleet Capital Corporation
  • Correspondent: not retrievable.
  • Context: Securitization.

• 2002-07-29 (executed) / recorded 2002-08-15 — Reel 013231/0360

  • Conveyance: Release by Secured Party
  • Assignor: Credit Agricole Indosuez, as Collateral Agent
  • Assignee: Holley Performance Products Inc.
  • Correspondent: not retrievable.
  • Context: Securitization unwind — 1998 acquisition lien discharged on refinancing.

• (execution date not retrieved) / recorded 2002-09-11 — Reel not captured

  • Conveyance: Termination of Security Interest
  • Assignor: Fleet Capital Corporation
  • Assignee: Earl's Supply Company; Holley Performance Products, Inc.; Nitrous Oxide Systems, Inc.
  • Correspondent: not retrievable.
  • Context: Securitization unwind associated with the Foothill refinancing.

• 2002-07-30 (executed) / recorded 2002-09-17 — Reel 013295/0543

  • Conveyance: Security Interest
  • Assignor: Holley Performance Products, Inc.
  • Assignee: Foothill Capital Corporation, California
  • Correspondent: not retrievable.
  • Context: Securitization — replacement senior credit facility.

• 2006-01-26 (executed) / recorded 2006-02-02 — Reel 017105/0764

  • Conveyance: Security Agreement
  • Assignor: Holley Performance Products Inc.; Holley Performance Systems, Inc.; Weiand Automotive Industries, Inc.; and others (11 named Holley-family entities incl. Biggs Manufacturing, Earl's Supply, Efastparts.com, Hooker Industries, KHPP Holdings, Lunati Cams, Nitrous Oxide Systems, So-Cal Speed Shops)
  • Assignee: U.S. Bank National Association, Massachusetts
  • Correspondent: not retrievable.
  • Context: Securitization — consolidated lien across the roll-up platform Holley built 1998–2001.

• 2008-03-28 (executed) / recorded 2008-03-31 — Reel 020723/0246

  • Conveyance: Security Agreement
  • Assignor: Holley Performance Products Holdings Inc.; Holley Performance Products Inc.; Holley Performance Systems, Inc.; Nitrous Oxide Systems, Inc.; Weiand Automotive Industries, Inc.
  • Assignee: U.S. Bank National Association
  • Correspondent: not retrievable.
  • Context: Securitization — exit financing for the prepackaged Chapter 11 (petition 2008-02-11; emergence ~2008-03-28).

• (execution date not retrieved) / recorded 2008-04-02 — Reel 020741/0193

  • Conveyance: Security Agreement
  • Assignor: Holley Performance Products Holdings, Inc.; Holley Performance Products Inc.; Holley Performance Systems, Inc.; Nitrous Oxide Systems, Inc.; Weiand Automotive Industries, Inc.
  • Assignee: Wells Fargo Foothill, Inc., Massachusetts
  • Correspondent: not retrievable.
  • Context: Securitization — reorganized-company ABL facility.

• 2010-06-22 (executed) / recorded 2010-06-28 — Reel 024599/0236

  • Conveyance: Release of Security Interest (releasing lien recorded at Reel 17105/0764)
  • Assignor: U.S. Bank National Association
  • Assignee: Holley Performance Products Holdings, Inc., Kentucky
  • Correspondent: not retrievable.
  • Context: Securitization unwind on emergence from the second Chapter 11 (filed 2009-09-28, effective 2010-06-22). Same reel series 024599 as the next entry, executed the same day.

• 2010-06-22 (executed) / recorded 2010-06-28 — Reel 024599/0288

  • Conveyance: Release of Security Interest (releasing lien recorded at Reel 020723/0246)
  • Assignor: U.S. Bank National Association
  • Assignee: Holley Performance Products Holdings, Inc. [recorded owner]
  • Correspondent: not retrievable.
  • Context: Securitization unwind, companion to the entry above.

• 2010-01-05 — Legal status event, not an assignment: anticipated expiration (20 years from the 1990-01-05 filing). Google Patents status remains "Expired – Fee Related."

No License, Merger, Change of Name, or Correction instruments appear in the record set for this patent. The only conveyances that change beneficial ownership are the two Coltec→Holley records (1998-05-12 and the 2000 cleanup); everything from 1998 onward is collateral.

Note on the "Current Assignee" field. Google Patents renders the current assignee as "Fleet Capital Corp." That is a rendering artifact, not a title fact: Fleet Capital's instruments were collateral-related and were terminated on 2002-09-11 (Reel 013295/0543 context). Title throughout 1998–2010 sat with Holley Performance Products, Inc. / Holley Performance Products Holdings, Inc. Do not rely on the "Fleet Capital Corp" field.

Timeline diagram

timeline
    title Ownership of US 5012780
    1990 : Application filed by Bugamelli
         : Inventor assigns to Coltec Industries
    1991 : Patent issues to Coltec Industries
    1992 : Bankers Trust records security interest
    1998 : Coltec sells Holley to management buyout
         : Holley takes title to the patent
         : Credit Agricole records security interest
    2000 : Second Coltec to Holley assignment recorded
    2001 : Fleet Capital records security agreements
    2002 : Credit Agricole lien released
         : Foothill Capital records security interest
    2006 : US Bank records consolidated security agreement
    2008 : US Bank and Wells Fargo record liens
         : Holley files Chapter 11 and emerges
    2009 : Holley files Chapter 11 a second time
    2010 : Secured lenders release all liens
         : Patent reaches end of term

NPE / troll-pattern signals

1. Shell-entity transfer — not present. No assignee in the chain carries an "IP / Patents / Licensing / Ventures" suffix. The only "Holdings" entity, Holley Performance Products Holdings, Inc., appears solely as the recorded owner on the 2010 releases at Reels 024599/0236 and 024599/0288 — i.e., the post-Chapter-11 parent of an operating manufacturer, not a single-purpose licensing vehicle. It is a Kentucky entity holding an operating business, not a Delaware/Texas registered-agent address.

2. Known asserter in the chain — not present. No assignee matches Acacia, Marathon, IV, IPNav, Wi-LAN, Mosaid/Conversant, Vringo, Pendrell, Innovatio, MPHJ, Lumen View, Round Rock, Document Generation Corp, or any Spangenberg entity. The terminal owner, Holley, is classified by RPX as an "Operating Company" / "Patent Owner" in Holley v. Aces Fuel Injection, 1:26-cv-00059 (E.D. Tenn., 2026-03-06). It appears in RPX's litigation database as a plaintiff operating company, not as a high-frequency NPE.

3. Repeat correspondent across the chain — unclear / insufficient data. This is the one signal I specifically could not test. The correspondent-of-record is not rendered in the sources I retrieved, so I cannot say whether a single attorney/firm filed the 1998 sale, the 2000 cleanup, the 2001–2002 Fleet/Foothill liens, the 2006 U.S. Bank lien, and the 2010 releases. I am not going to infer recurrence from the pattern of records alone. If you can supply the Assignment Center record pages (or a CSV export), the recurrence test is straightforward: the 2006 and 2008 U.S. Bank security agreements and the 2010 releases were all part of one restructuring and are the most likely to share a firn. This gap should be closed before this reconstruction is relied on.

4. Cascading transfers — not present as an NPE pattern (though there is clustering). Four records land inside 21 months: Reels 009405/0182 (1998-05-12), 009197/0852 (1998-05-15), plus the 2000-02-24 cleanup at Reel 010639/0074; and four more inside 19 months at Reels 011641/0166, 012232/0173, 013231/0360, 013295/0543 (2001-03 to 2002-09). But every one of these runs from or to the same single beneficial owner (Coltec → Holley, or Holley ↔ its lenders). That is a leveraged buyout plus a refinancing cycle, not serial assignment through unrelated LLCs. No two assignees share a correspondent address or common principal as far as the record shows.

5. Pre-litigation transfer — not present. There is no infringement litigation involving US 5,012,780 that I could find. Holley's assertion activity — Holley v. Barry Grant (N.D. Ill. 2004, DJ on Barry Grant's '817 patent), Holley v. Quick Fuel Technology (W.D. Ky. 1:07-cv-185, 2007, trademark/copyright), and Holley v. Aces Fuel Injection (E.D. Tenn. 2026, patents '515/'083/'894/'434) — involves other patents and other rights entirely. Notably, the last recorded instrument (2010-06-22/28) post-dates the patent's practical enforceability window, and the patent had expired 2010-01-05, before any of the modern Holley EFI assertions.

6. Bankruptcy fire-sale — present as an event, not as a sale of this patent. Holley filed Chapter 11 twice: prepackaged petition ~2008-02-11, emergence ~2008-03-28 (Reel 020723/0246 executed 2008-03-28); and again 2009-09-28, emerging 2010-06-22 (Reels 024599/0236 / 024599/0288). In the second case Holley sold its diesel OEM business. But the '780 patent stayed with Holley throughout and the lenders' liens were released back to Holley, not assigned away. No proceeding sold this patent to an NPE. The earlier 2008 case had assets of ~$106M against ~$243M of debt (per the Tomlinson affidavit reported at the time) — a genuine distress situation, but one that did not disgorge the patent estate.

7. Privateering — not present. No operating-company-to-NPE transfer; no evidence of Coltec or Holley funding an assertion vehicle. The 1998 sale was a divestiture of a business unit to its own management and a private-equity sponsor (Kohlberg & Co.), which is the opposite of privateering: the patent followed the operating business.

8. Defensive aggregator (anti-NPE) — not present. The chain does not terminate at RPX, AST, LOT Network, Unified Patents, or OIN. It terminates with Holley Performance Products Holdings, Inc. as owner of record following the 2010 lien releases.

Verdict

Operating-company assertion

Justification. Every instrument that changes beneficial ownership is an operating-company transaction: the inventor's assignment to Coltec Industries Inc. (Reel 005581/0743, executed 1990-12-12) and Coltec's two transfers of the patent with the Holley business to Holley Performance Products Inc. (Reels 009405/0182, executed 1998-05-12, and 010639/0074, recorded 2000-02-24). Every subsequent record from 1998 to 2010 — 009197/0852, 011641/0166, 012232/0173, 013295/0543, 017105/0764, 020723/0246, 020741/0193 — is a collateral lien from Holley to a commercial lender, discharged by the releases at 013231/0360 and 024599/0236/0288; none of them transfers the patent out of the operating company. There is no NPE anywhere in the chain, no pre-litigation transfer, and no defensive-aggregator terminating entity, so none of the NPE or defensive verdicts can be sustained. The owner of record is an operating manufacturer of EFI throttle bodies that does litigate its portfolio against competitors (Holley v. Aces Fuel Injection, 1:26-cv-00059, E.D. Tenn., 2026-03-06) — the classic operating-company-assertion posture. Important qualification: this verdict describes the assignee's portfolio posture, not this patent. US 5,012,780 expired 2010-01-05 and was never asserted; it cannot support an NPE verdict and cannot support an assertion today.

Two open items I will not paper over: (i) the correspondent-of-record is unretrieved, so signal 3 is unresolved; and (ii) Coltec's post-1998 corporate fate was not verified in this session.

Verify at: https://assignmentcenter.uspto.gov/ (search patent 5012780) · legacy interface: https://assignment.uspto.gov/patent/index.html

I'll research the specific patent and each of its cited references. Let me start with targeted searches.

Now let me research the remaining cited references.

Prior Art Analysis — U.S. Patent No. 5,012,780

1. Identification of the Patent (literal number, no auto-correction)

Confirmed via Google Patents (https://patents.google.com/patent/US5012780/en), Justia (https://patents.justia.com/patent/5012780), FreePatentsOnline record (https://www.freepatentsonline.com/5012780.html), and the DOE/OSTI bibliographic record (https://www.osti.gov/biblio/[5065035](/patent/5065035)). I searched the specific string 5012780 / 5,012,780; I did not rely on results for similar numbers, and the "780"‑suffix hits that surfaced elsewhere (US 6,052,780, US 6,260,780, US 6,733,780, US 5,113,780) are different patents and are excluded here.

2. ⚠️ Contradiction flagged in the previously generated sections

The earlier Litigation summary states:

"the examiner cited seven references, including US 4,708,117 … other cited references include US 4,096,831; US 4,212,277; US 4,341,193; US 4,347,823; US 4,705,001; and US 4,827,897."

This is inconsistent with the patent's own front page. The "Patent Citations (7)" table for US 5,012,780 lists exactly these seven references — and US 4,708,117 is not one of them:

US 4,096,831 · US 4,212,277 · US 4,341,193 · US 4,347,823 · US 4,372,271 · US 4,705,001 · US 4,827,897

US 4,708,117 appears only in the specification body ("A detailed description of one form of a solenoid actuated injector operable in response to a pulse width modulated control signal is disclosed in U. S. Pat. No. 4,708,117 to which reference may be had"), i.e. it is incorporated by reference, not listed as front-page cited art. The prior section appears to have substituted 4,708,117 for the actual seventh citation, US 4,372,271 (Bendix, "Single point intermittent flow fuel injection"). The authoritative full patent text controls, so the correct citation set is the seven listed above. I handle US 4,708,117 separately in §5 below.

3. The seven cited references — full citations and descriptions

R1. US 4,096,831 A — "Frequency modulated fuel injection system"

• Assignee / inventor: The Bendix Corporation; inventor Gunda.
• Filed / published: 1976‑10‑04 / 1978‑06‑27.
• Description: Single‑point electronic fuel injection. A manifold‑absolute‑pressure sensor and an ignition‑pulse (engine‑speed) sensor feed a multiplier that produces a mass‑air‑flow signal. The signal drives a voltage‑controlled oscillator; the VCO output feeds a pulse generator producing pulses of fixed on‑time whose off‑time (hence frequency) varies inversely with VCO frequency. Pulses pass through an OR gate to the injector solenoid. Includes a feedback duty‑cycle switch that reduces multiplier output and lengthens pulse duration at high duty cycles, a temperature‑responsive cold‑start circuit, and an optional primary/secondary injector.
• URL: https://patents.google.com/patent/US4096831 ; https://www.freepatentsonline.com/[4096831](/patent/4096831).html

R2. US 4,212,277 A — "Economy throttle body for hot fuel handling"

• Assignee / inventor: The Bendix Corporation; inventor Melotti.
• Filed / published: 1978‑03‑06 / 1980‑07‑15.
• Description: A two‑piece throttle body — upper member (containing the fuel passages, inlet/outlet accumulation chambers and the injector mounting) and lower throttle member (carrying the throttle) — separated by a thermal barrier (cellulose‑fiber cork nitrile rubber) to stop manifold heat reaching the fuel. Inclined fuel delivery passages prevent bubble/vapor lock; the injector mounts concentrically in the air‑induction bore above the throttle and sprays a hollow cone; a pressure regulator maintains constant fuel pressure in the accumulation chambers.
• URL: https://www.freepatentsonline.com/[4212277](/patent/4212277).html

R3. US 4,341,193 A — "Low pressure throttle body injection apparatus"

• Assignee / inventor: General Motors Corporation; inventor Lauren L. Bowler.
• Filed / published: 1978‑07‑06 (continuation‑in‑part of Ser. No. 853,331, filed 1977‑11‑21) / 1982‑07‑27.
• Description: Low‑pressure (~10 psi) single‑point TBI. One or two electromagnetic injectors sit above the throttle bore and are pulsed in timed relation to the crankshaft. The housing defines an annular fuel well that bathes and cools the injector; excess fuel flow is at least twice the maximum injection rate and circulates through a pressure regulator in the fuel return passage back to the tank; includes vapor‑return passages so only liquid fuel reaches the metering orifice. Regulator and injectors are integrated into the throttle‑body housing.
• URL: https://patents.google.com/patent/US4341193 ; https://patents.justia.com/patent/[4341193](/patent/4341193)

R4. US 4,347,823 A — "Throttle body injection apparatus with distribution skirt"

• Assignee / inventor: General Motors Corporation; Kessler et al.
• Filed / published: 1981‑02‑24 / 1982‑09‑07.
• Description: Throttle‑body (single‑point) fuel injection apparatus employing a distribution skirt to control/improve the distribution of injected fuel into the induction bore above the throttle valve. Classified in 123/472 (electrically actuated injector throttle‑body systems), the same field as R3.
• URL (bibliographic): https://patents.google.com/patent/US4347823

R5. US 4,372,271 A — "Single point intermittent flow fuel injection"

• Assignee / inventors: The Bendix Corporation; Elpern and Casey.
• Filed / published: 1977‑03‑17 (priority; granted on application 6/229,492 filed 1981‑01‑29) / 1983‑02‑08.
• Description: Single‑point intermittent fuel injection in which one injector per throttle‑body throat is pulsed once per cylinder at a fixed crank angle for cylinder‑to‑cylinder distribution, using sonic nozzles. The electronic control unit is a modification of Bendix ECU II‑1 and includes: a base pulse; a multiplied pulse; an acceleration‑enrichment pulse generated from a throttle‑position rate‑of‑change (differentiator) network and a wide‑open‑throttle comparator; a cold‑start pulse; and temperature correction of the enrichment pulse. Acceleration enrichment is explicitly added to the base pulse width.
• URL: https://patents.google.com/patent/US4372271 ; https://patents.justia.com/patent/[4372271](/patent/4372271)

R6. US 4,705,001 A — "Device for controlling engine and method thereof"

• Assignee / inventor: Mitsubishi Jidosha Kogyo Kabushiki Kaisha; Danno et al.
• Filed / published: 1984‑03‑15 / 1987‑11‑10.
• Description: An electronic engine‑control device/method computing and delivering a fuel‑injection quantity control signal (pulse width) as a function of sensed engine operating conditions. Confidence note: I retrieved only the bibliographic data for this reference; I reached the search‑step limit before obtaining its full text, so the description above is limited to what the title, assignee, date and classification support. Do not rely on it as a verified element‑by‑element teaching without pulling the document.

R7. US 4,827,897 A — "Fuel pump driving apparatus"

• Assignee / inventor: Nippondenso Co., Ltd.; Yamada et al.
• Filed / published: 1986‑09‑17 / 1989‑05‑09.
• Description: Apparatus for driving/controlling a fuel pump in an electronic fuel‑injection system (pump speed/drive control responsive to engine operating state). Same confidence note as R6 — bibliographic data verified; full text not retrieved before the step limit.

4. §102 anticipation assessment, reference by reference

Legal standard applied: a reference anticipates under 35 U.S.C. §102 only if it discloses every limitation of the claim, arranged as in the claim. A reference teaching fewer than all limitations is §103 (obviousness) art, not §102 art.

Threshold observation that governs the whole analysis: every one of the 18 claims is either an independent claim that expressly recites (a) throttle‑position‑responsive pulse‑width generation and (b) a set of externally accessible, manually operable mixture adjustments (idle / mid‑range / high‑RPM, and in claim 1 an accelerator‑pump adjustment), or a dependent claim that inherits those limitations. None of R1–R7 discloses user‑adjustable idle/mid‑range/high‑RPM mixture potentiometers, and none discloses a user‑adjustable accelerator‑pump adjustment. On that basis, no claim of US 5,012,780 is fully anticipated by any single one of the seven cited references. What the references do supply is element‑level art:

Best single‑reference and combination theories (§103, not §102)

Because no reference anticipates, the cited art is properly used as §103 combination art:

• R5 (US 4,372,271) + R1 (US 4,096,831) — single‑point TBI with throttle‑position/RPM electronic control and throttle‑position‑rate acceleration enrichment (R5), in combination with an RPM‑driven voltage‑controlled oscillator and adjustable duty cycle (R1), addresses the frequency‑generating and accelerator‑pump‑adjustment aspects of claims 1 and 3.
• R3 (US 4,341,193) + R2 (US 4,212,277) — the fuel‑over‑supply/return regulator of R3 with the constant‑pressure accumulator and thermal‑isolation body of R2 addresses claims 7 and 8.
• R7 (US 4,827,897) — the fuel‑pump driving art to meet the pump‑control limitations of claims 8, 9 and 17.
• R4 (US 4,347,823) and R6 (US 4,705,001) — secondary/background art on injector placement and pulse‑width computation respectively.

5. Reference incorporated by the specification but not front‑page cited

US 4,708,117 — cited in the specification body (not in the front‑page citation list; see the contradiction flag in §2) as disclosing "one form of a solenoid actuated injector operable in response to a pulse width modulated control signal" and the duty‑cycle injector operation. It is prior art by date (it issued before the 1990‑01‑05 filing) and is relevant to the injector‑structure and duty‑cycle limitations of claims 7 and 9. Confidence note: I did not retrieve US 4,708,117's own bibliographic record or full text within the available steps, so I give no issue date, inventor or assignee for it and flag that its precise teaching must be verified before being relied on. Do not treat the earlier section's description of it as a "cited by the examiner" reference — that characterization is not supported by the patent's front page.

6. Bottom line

1. The seven front‑page prior‑art citations for US 5,012,780 are: US 4,096,831; US 4,212,277; US 4,341,193; US 4,347,823; US 4,372,271; US 4,705,001; US 4,827,897 — not US 4,708,117 (which is incorporated by reference only).
2. No single cited reference anticipates any of claims 1–18 under §102. The two limitations that defeat anticipation across the board are (a) pulse width generated in proportion to sensed throttle position, and (b) externally accessible, manually operable mixture adjustments for idle, mid‑range and high‑RPM (and the accelerator‑pump adjustment of claim 1). Neither appears in any of the seven.
3. The most material single reference is US 4,096,831 (RPM‑responsive frequency generation via a voltage‑controlled oscillator, PWM injector drive) — most relevant to claim 12 and to the frequency‑generating means of claims 1/3/10; the most material reference on the acceleration‑enrichment aspect of claim 1 is US 4,372,271.
4. The cited art is therefore best characterized as §103 combination art, not §102 anticipation art — which is consistent with the patent having issued with 18 claims and never having been the subject of a PTAB or litigation challenge (per the previously generated sections).

Limitations of this analysis: (i) I could not retrieve full texts of US 4,347,823, US 4,705,001, US 4,827,897, or US 4,708,117 before exhausting my search steps, so the descriptions for those are bibliographically grounded but not element‑by‑element verified; (ii) the §102/§103 mapping above is based on the claim language as printed in the patent text supplied, and on the abstract/specification passages retrieved for R1, R2, R3 and R5; (iii) no automated USPTO "prior art search" citation report or examiner's reasons‑for‑allowance were available, so the examiner's actual grounds of allowance are not reflected here.

I'll ground this analysis in the actual prior-art references before mapping them to the claims.

Obviousness Analysis — U.S. Patent No. 5,012,780 under 35 U.S.C. § 103

Analyst note on inputs. Grounded on the seven references listed under "Patent Citations (7)" in the patent's own Prior Art section — US 4,096,831; US 4,212,277; US 4,341,193; US 4,347,823; US 4,372,271; US 4,705,001; US 4,827,897 — plus US 4,708,117, which the specification incorporates by reference but which is not one of the seven cited references (see Contradiction #1 below).

1. Governing framework and POSITA

The §103 inquiry follows Graham v. John Deere (scope/content of prior art; differences; level of ordinary skill; secondary considerations), as refined by KSR Int'l v. Teleflex (a combination of known elements is obvious where a POSITA would have had a reason to combine with a reasonable expectation of success) and MPEP 2143/2144.

Level of ordinary skill (as of 1990-01-05): a bachelor's degree in mechanical or electrical engineering (or equivalent) plus roughly 2–4 years of experience in automotive fuel systems or analog electronic engine control; or a lesser formal credential with proportionally more experience. This is set by the prior art itself — the cited references are all issued to in-house engineering organizations (Bendix ×3, GM ×2, Nippondenso, Mitsubishi) and describe the state of the control art at a level that assumes routine analog-circuit competence. The '780 specification confirms this: "Electronic control units for this purpose have been available for quite some time, and the design of appropriate circuitry for converting the monitored inputs to the appropriate output signal is well understood." That sentence is a §103 admission and materially shrinks the space in which any claim can be non-obvious.

Construction of the functional limitations. Claims 1, 3 and 10 are drafted in means-plus-function form (§112 ¶6). Corresponding structure from FIG. 6: "frequency signal generating means" = signal conditioner 166 + RPMV generator 164 (F/V converter) + VCO 154; "pulse width signal generating means" = duration-voltage/sample-and-hold circuit 168 + analog multiplier 176 fed by TPS 46/buffer 170; "means for generating a pulse width modulated signal" = duration circuits 152A/152B + oscillator 154; "accelerator pump adjustment means" = capacitor-based accelerator pump circuit 188 + potentiometer 72. Two construction points matter for obviousness: (i) claim 1's accelerometer term is drafted as "adjustably responsive to a full open position of the throttle plate sensor means … to increase the pulse width and the frequency in proportion thereto" — the "in proportion thereto" antecedent is ambiguous (in proportion to the throttle position? to the rate of change?), which invites either a broad reading (any simultaneous widening + frequency boost on tip-in) or a narrow one; (ii) "stand-alone" and "manually operable adjustment means" in the preambles are, at most, statements of intended use/environment and do not import structure beyond the recited potentiometers 70/72/74/76/78.

2. Disclosure mapping — the prior art of record

3. The §103 case, claim group by claim group

Group A — Claims 1, 3, 10 (the PWM/frequency/pulse-width architecture)

Every recited element except one is disclosed: '831 discloses RPM-derived frequency generation into a voltage-controlled oscillator and a downstream pulse-duration stage; '271 discloses the throttle-body + solenoid injector + electronic control unit combination, pulsed on a "preselected timing scheme"; '193 discloses fuel metering by proportion of time the valve is open — i.e., pulse-width metering. Claim 12's VCO limitation is disclosed essentially verbatim by '831, and claim 14's TPS/RPM signal means are in both '831 and '271.

Claim 1's sole point of departure is the accelerator-pump adjustment that feeds both the pulse-width channel and the frequency channel. The combination rationale is strong:

• Express teaching in the art to keep pulse duration within the injector's linear range. '831 identifies exactly the problem the '780 solves with its minimum-duration clamp circuit 178 — small pulse widths at idle/light load are inaccurate. A POSITA adding transient-tip-in enrichment to a system already constrained at the bottom of the linear range would necessarily raise the frequency of injection as well as the width, because a further-widened pulse at fixed frequency risks over-fueling and injector saturation. '831 supplies the design constraint; the claimed dual-channel response is the predictable solution.
• Known carburetor function, known location. "Accelerator pump" enrichment is the classic carburetor transient-fuel circuit; the entire premise of the '780 is carburetor replacement, so porting the accel-pump function into the electronic fuel schedule is use of a known technique for its known purpose (MPEP 2144.04).
• Same-channel precedent. The companion Bendix disclosure US 4,096,833 — same title family, same inventors' organization, filed the same day as '831 — recites a "separate control input for varying the output signal level of the multiplier circuit by a preselected factor" and a duty-cycle switch that simultaneously modifies the multiplier output (→ frequency) and the pulse width. That is the claimed dual-channel adjustment in substance. Caveat: US 4,096,833 is not among the seven references of record; it is offered as a same-field reference a POSITA would consult.

Claims 3 and 10 substitute the three-regime trims (idle / mid-range / high-RPM) for the accel-pump adjustment. Obviousness here rests on: (i) '831's analysis that injector accuracy (and therefore the required correction) differs sharply between idle/light-load and high-load operation — which is a reason to provide separate trims per regime; (ii) '831/'833's adjustable multiplier factor; and (iii) the conventional carburetor circuit partition (idle circuit, main metering, power enrichment) that the retrofit expressly mimics. The design incentive is decisive: a retrofit sold across a 240–450 in³ displacement range cannot be calibrated at the factory, so external, regime-specific trims are the predictable engineering response.

Group B — Claims 2 and 6 (system-level combination; adapter)

The throttle body/air passage/throttle/injector/pump/TPS + engine-speed control elements are disclosed by '271 and '193 (see table). The adapter-plate and coolant-gas limitations are weaker:

• Adapter/bolt-on mounting (claims 2, 6): '193 claims a unit "mountable over the top face of the throttle body," and '271's throttle body is throat-per-manifold-plane and mounts to the manifold; the step of interposing a drilled/sealed plate between a throttle body and an existing manifold flange is a routine mechanical expedient (KSR: familiar elements, known methods, predictable result). '823's "distribution skirt" is an analogous interposed flow-directing element.
• Coolant chamber in the adapter (claims 4, 6, 13): This is the weakest link in the case built from the cited art alone. None of the seven verified references expressly discloses a coolant-circulating plate. The motivation is easy to articulate (icing of throttle plates in a retrofit installed on vehicles with heat-riser/divorced-choke manifolds; engine coolant is the available heat source) and analogous coolant/exhaust-heated manifold plates were known, but a challenger should expect to add a secondary reference (heated manifold spacer / heat-riser art) or rely on a "known technique" argument under MPEP 2144.04. '193's extensive heat-management teaching ("heat conducting wall," circulation "to provide heat transfer cooling," "avoid substantial fuel vaporization") establishes that thermal control of a TBI was a recognized design problem — useful for motivation, not for disclosure.
• Claim 5 (control unit isolated from the engine compartment): routine packaging; ECUs of the '271 generation (Bendix ECU II-1, part numbers 1611188–1611191) were conventionally remote-mounted and coupled by connector/cable — the '780 itself describes exactly that arrangement.

Group C — Claims 7, 8, 9 (dual injectors, constant-pressure chamber, over-supply/return, pump signal)

Strong. '193's claim 6 supplies two injectors in injector portions with a common regulator maintaining a predetermined low pressure upstream, plus the express over-supply-and-circulate teaching. '271 supplies the fuel-bowl regulator and return-to-tank. Claim 9's "second electrical signal" to hold constant inlet pressure is met by '897's ECU-controlled pump drive. Motivation: constant injection pressure is a prerequisite stated in the art for pulse-width metering to be repeatable ('193: "the amount of liquid fuel entering the engine is determined by the proportion of time said valve is in elevated position"); an inventor cannot achieve that metering without regulating pressure.

Group D — Claims 11–18 (dependent claims)

4. Why a POSITA would have combined these references

1. Same field, common assignees, cross-referencing. All seven are electronic fuel-injection/throttle-body references for spark-ignition engines; three share the Bendix assignee and two the GM assignee. '271 is the strongest motivation source because it expressly instructs combination: it describes taking a commercially sold Bendix ECU (ECU II-1 series) and modifying it to implement a new single-point injection scheme. That is a printed "combine and modify" teaching directed at the very subsystem the '780 claims.
2. The '780's own admissions. "Electronic control units … well understood"; "The precise construction of pressure regulator 24 and injectors 22A and 22B may take any of several well known forms"; express incorporation of '117 for injector and duty-cycle details. What remains is the arrangement and external accessibility of the trims plus the adapter — a narrower and more vulnerable target.
3. Recognized problem, predictable solution (KSR). The retrofit market needs field calibration across a wide displacement range; the references supply the metering hardware, the mass-air/RPM-derived frequency generation, the pressure regulation, and the pump control. Assembling these yields no more than the expected sum of their known functions.
4. No teaching away of record. The best counterargument available to the patent owner is '831's criticism of TPS-based scheduling in the Suda prior art ("there is no provision for sensing the mass of the air flow to the engine"). This is weak: '831's criticism goes to using TPS as a mass-air-flow surrogate for base fuel scheduling, whereas the '780 claims use TPS for pulse-width shaping with RPM-derived frequency and manual trims — a different control philosophy that '831 does not disparage. A finding of teaching away would require the reference to criticize the claimed approach itself.

5. Where the patent is strongest (and the counterarguments)

6. Contradictions and caveats flagged against the previously generated sections

1. US 4,708,117 is not a cited reference. The prior "Litigation summary" states "the examiner cited seven references, including US 4,708,117." The authoritative Prior Art section lists seven citations — US 4,096,831, US 4,212,277, US 4,341,193, US 4,347,823, US 4,372,271, US 4,705,001, US 4,827,897 — and none is '117. '117 appears only as a specification incorporation-by-reference. Correct the record accordingly; it affects which references are "of record" for motivation-to-combine purposes.
2. "Cited By" entries are not prior art. The 24/40 forward citations (including US 5,261,382, priority 1992-09-22, and US 10,012,197) post-date the 1990-01-05 priority date and must not be used in the §103 analysis.
3. Expiration is internally inconsistent across sources. The assignment record shows a LAPS/"LAPSE FOR FAILURE TO PAY MAINTENANCE FEES" event and PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362, while Google lists "anticipated expiration 2010-01-05" and "Expired – Fee Related." The date "2010-01-05" appears to be the nominal 20-year date rather than the actual lapse point. Immaterial to §103, but do not state a single expiration date without checking PatentCenter.
4. Unverified details carried forward. Examiner/attorney names ("Willis R. Wolfe / Howard S. Reiter") and the inventor's city are in the earlier summary but are not present in the authoritative text I was given; treat as unverified.
5. Internal inconsistency in the patent's own text. The cold-start paragraph states "corrective adjustment may be made by the choke potentiometer 72," whereas 72 is elsewhere the accelerator-pump adjustment and 70 is the choke adjustment. This typographical error bears on how narrowly "choke adjustment" (70) should be construed relative to the "accelerator pump adjustment" (72) recited in claim 1.
6. Claim 18 is truncated at "for adjusting the pulse" in every retrieved copy; the final limitation is unrecoverable, so claim 18 is analyzed only as far as recited.
7. Practical posture. The '780 patent's term appears ended and it has no litigation or PTAB history (per the earlier sections). This analysis is therefore retrospective/defensive — relevant to a validity opinion, a family-member evaluation, or prior-art-of-record due diligence, not to a live infringement defense on the '780 itself.

Sources: Google Patents US5012780A (authoritative full text); US 4,096,831 — FPO; US 4,096,833 — FPO (supplemental, not of record); US 4,341,193 — Google Patents and PDF; US 4,372,271 — Google Patents; US 4,827,897 — OSTI and uspto.report; US 4,791,905 — FPO (sibling art for pump-control motivation).