Invalidity dossier
US 5595163
Added 9/21/2026, 9:43:13 AM
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Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview: US5595163A
Title: Apparatus and method for controlling the fuel supply of a gas-fueled engine
Patent number: US5595163A
Application number: US08/467,817
Inventors: Toshiharu Nogi, Robert I. Bruetsch, George Saikalis
Original/current assignee (as listed): Hitachi America Ltd
Priority/filing date: 1995-06-06
Publication (grant) date: 1997-01-21
Legal status as listed: Expired – Lifetime (anticipated expiration 2015-06-06)
Purpose (from the supplied text): The patent concerns controlling the fuel supply of a gas-fueled engine. The listed prior-art keywords — air, gas, air intake, valve, outlet — indicate the subject matter centers on an air intake, a valve, and an outlet in the fuel/air supply path. Classification entries are consistent with this: F02D19/02 and F02D19/021/023/026/027 (controlling engines using gaseous fuels, including fuel mass/volume flow and fuel-supply-system parameters), F02D41/0027 (gaseous fuel), and G01F1/68–1/6842 (thermal-effect flow measurement and structural arrangements for influencing fluid flow). Frequent indexed terms include fuel, combustion, gas, mixture, communication, controlling, and upstream.
Plain-language scope (from the supplied text only): The excerpt establishes that this is a granted US patent directed to an apparatus and a method for controlling how fuel is supplied to an engine burning gaseous fuel, involving air intake, valve, and outlet elements, and involving measurement of flow using thermal effects per the classifications. The claims, abstract, and description are referenced in the source text but their wording is not reproduced here, so the precise scope cannot be stated.
Source: https://patents.google.com/patent/[US5595163](/patent/US5595163)/en
What the excerpt does not establish: The excerpt does not provide the claim language, abstract, or specification text; therefore the exact claimed apparatus/method, the specific control technique, and the embodiments are not established. It also does not establish priority beyond the listed 1995-06-06 date, the accuracy of the assignee listing, or the legal status (the source itself notes status is an assumption and not a legal conclusion). No litigation, ownership-transfer, validity, or prior-art analysis is undertaken here.
Generated 10/1/2026, 10:01:53 PM
Cases on file (0)
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Litigation summary
Past and pending lawsuits — plaintiffs, defendants, jurisdictions, outcomes, and notable rulings.
Proceedings on file (0)
All PTAB activity →AIA trial proceedings (IPR / PGR / CBM) filed at the USPTO Patent Trial and Appeal Board against this patent. Sourced from the USPTO Open Data Portal and refreshed every six hours; each proceeding number deep-links to the PTAB E2E docket.
No PTAB proceedings on file. This patent has not been challenged via IPR, PGR, or CBM. The absence is itself a signal — well-asserted patents eventually attract IPRs. The LLM analysis below may surface filings the ODP feed hasn’t indexed yet.
PTAB challenges
AIA trial proceedings at the USPTO Patent Trial and Appeal Board — IPR, PGR, and CBM. Petitioners, judge panels, claim-level invalidation outcomes from Final Written Decisions, and Federal Circuit appeals. The single most important defensive datapoint after litigation history.
Assignment history
Inventors, original assignee, and the chain of ownership recorded with the USPTO — including the correspondent attorney who recorded each assignment, since shell-LLC chains often share one repeat-player attorney even when the entity names look unrelated. Surfaces NPE / patent-troll patterns: shell-entity transfers, known asserters in the chain, repeat correspondent fingerprints, pre-litigation assignments, and bankruptcy fire-sales.
Prior art
Earlier patents, publications, and products that may anticipate or render the claims unpatentable.
Obviousness
Combinations of prior art that suggest the claimed invention would have been obvious under 35 U.S.C. § 103.
Extensions
Patent term adjustments, term extensions, continuations, divisionals, family members, and expiration dates.
Derivative works
Defensive disclosure: derivative variations of each claim designed to render future incremental improvements obvious or non-novel.