Invalidity dossier
US 1234129
Added 9/21/2026, 10:18:45 AM
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Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US 1234129 A
Title: Oil-burner.
Inventor / Assignee: Ira M Carr (inventor); original assignee listed as Individual. No corporate assignee appears in the supplied record.
Key dates: Priority and filing date 1916-06-17; application granted and published 1917-07-24; anticipated expiration 1934-07-24. Legal status listed as "Expired – Lifetime" (the source notes this status is an assumption, not a legal conclusion).
Application number: US10434616A. Classification: F23D11/00, F23D11/36, F23D11/44 — burners using direct spraying of liquid droplets or vaporized liquid, including preheating and vaporizing devices.
Purpose: The stated principal object is a burner "adapted for transforming kerosene oil into a combustible gas and consuming the same for heating purposes."
Plain-language scope (per the supplied description): The burner uses a retort formed as a coil of pipe (37/38) through which kerosene passes and is vaporized, the coil being supported on standards (20) in the path of both the alcohol preheating flame and the burner flame. Vaporized kerosene travels by pipe B to a spray nozzle (42) having a restricted central opening (45), with an adjustable shield (46) held by a set screw (50) to block drafts. The jet passes through a tube (26) into a mixing region, where warmed air from an air-heating chamber (admitted via air inlet openings 18) mixes with the gas. A dome-shaped cap (28) has a central deflecting tit (31) that divides the mixture outward toward burner openings (33) and upwardly inclined dome openings (34). A bypass — an annular series of cap openings (25) between spaced walls (24, 32) — returns unconsumed combustible gas to the warming chamber to reduce loss. A valve block (51) with turning plugs (57) controls liquid flow from supply passage (54) to the burner outlets. The supporting frame (1) is extensible, with slidable arms (7) and attaching ears (11), to fit fire boxes of varying lengths. A stated advantage is that alcohol preheating need not burn out before operation begins.
Source: https://patents.google.com/patent/US1234129/en
Not established by the excerpt: the claims, the complete valve and nozzle description (text is cut off mid-sentence), drawing content, whether any claims were allowed or rejected, and any litigation, ownership transfer, validity, or prior art not mentioned above.
Generated 10/1/2026, 10:01:51 PM
Cases on file (0)
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Litigation summary
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Proceedings on file (0)
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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
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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.