Invalidity dossier
US 5807512
Added 9/23/2026, 6:13:42 PM
Active provider: DeepSeek · deepseek-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US 5,807,512
Title: Carburetor with replaceable booster venturis
Patent number: US5807512A
Application number: US08/824,420
Inventor: Barry Grant
Original assignee: Individual
Current assignee (as listed): Holley Performance Products Inc.
Priority date: 1997-02-14 (claimed from US08/801,721)
Filing date: 1997-03-26
Grant/publication date: 1998-09-15
Status: Expired – Lifetime (anticipated expiration 2017-02-14)
Purpose and plain-language scope. According to the supplied text, the patent concerns a carburetor in which the booster venturis are replaceable. The listed prior-art keywords are "carburetor," "tool," "sidewall," "venturi," and "conduit," indicating the disclosure addresses a venturi structure, a surrounding sidewall, a conduit, and a tool for installation or removal. Classifications place it among carburetor venturi arrangements, including venturis in multiple or series arrangement (F02M19/08, F02M19/10) and carburetors with venturi and nozzle relatively displaceable along the venturi axis (F02M9/14). The excerpt does not quote the claims, so the precise metes and bounds of the claimed invention—such as how a booster venturi is secured, sealed, or removed—cannot be stated from this text alone; the extraction counts 6 claims, an abstract of 48 words, and a 14-word description segment, but the claim language itself is not reproduced here.
Source: https://patents.google.com/patent/US5807512/en
What the excerpt does not establish. It does not show the claims, abstract, description, or drawings in full; does not identify specific prior-art references or compare the invention against them; and does not establish enforceability, validity, or infringement. Assignments and security interests listed on the page are recordation events only and are not analyzed here. No litigation, ownership-transfer merits, validity, or prior-art conclusions are drawn, per the operating instructions.
Generated 10/1/2026, 9:42:55 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.