Invalidity dossier
US 4348338
Injection-type pressure-freed carburetor
Current assignee: Individual
Added 9/23/2026, 9:45:27 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 — US4348338A
Title: Injection-type pressure-freed carburetor
Patent number: US4348338A
Application number: US06/251,060
Inventors: Jose L. P. Martinez; Jose P. Osorio
Original Assignee: Individual
Current Assignee (per source, listed as possibly inaccurate): Individual
Prior art date: 1978-10-18
Filing date: 1981-04-06
Publication/grant date: 1982-09-07
Anticipated expiration: 1999-09-07
Legal status (as listed): Expired – Fee Related
Purpose and plain-language scope (based only on the supplied text):
The document describes an "injection-type pressure-freed carburetor" for supplying and treating fuel-air mixtures in combustion engines. According to the classification and keyword data in the excerpt, the subject matter relates to apparatus for thermally treating combustion-air, fuel, or fuel-air mixture, including heating fuel and heating fuel to vaporize it (F02M31/00, F02M31/02, F02M31/16, F02M31/18).
Recurring terms in the excerpt's claim/abstract/description analysis include fuel, carburetor, housing, interconnecting, valve, injection, mixture, acceleration, spray, combustion reaction, water, heat treatment, and emulsifying agents. This indicates the disclosure addresses fuel injection and mixture formation, with mentions of water and emulsifying agents and of heat treatment, and with attention to combustion byproducts such as carbon monoxide, carbon dioxide, and nitric oxide, as well as hydrocarbons and gasoline. The excerpt does not reproduce the actual claims, abstract wording, or detailed description, so the precise structural and method scope cannot be stated from this source alone.
Source: https://patents.google.com/patent/[US4348338](/patent/US4348338)/en
What the excerpt does not establish:
- The literal text of the claims or abstract (not reproduced here).
- The specific components, arrangements, or operating method of the carburetor.
- Any measured performance, emissions, or efficiency results.
- The identity or content of any cited prior art references.
- The accuracy of assignee, priority date, or legal status (the source itself labels these as assumptions).
- Any litigation, ownership transfer, or validity information (not researched, per instructions).
Generated 10/1/2026, 9:34:02 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.