Invalidity dossier
US 974795
Crude-oil burner.
Current assignee: CHARLES L KEESLAR
Added 9/21/2026, 9:35:38 AM
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 9,747,95 A
Title: Crude-oil burner
Inventor: Lee O. Hudson, of Altus, Oklahoma
Assignee: Charles L. Keeslar (assignor of one-half), also of Altus, Oklahoma
Filing date: October 2, 1909 (Application Serial No. 520,616)
Publication/grant date: November 8, 1910
Legal status (per source): Expired – Lifetime; anticipated expiration November 8, 1927
Purpose. The invention relates to burners for oil stoves, "particularly to that character of burner which is adapted to be applied within an ordinary stove and rest upon the grate thereof." The stated object is an "extremely simple form of crude oil burner, cheaply constructed and capable of being very easily inserted or removed from an ordinary stove," providing means whereby oil vapor is mixed with water vapor "in order to gain a more perfect combustion of the fuel."
Plain-language scope. A pan (2) with upwardly and outwardly deflected sides (3) sits on the stove grate; one side extends and curves outward as a shield (1). The pan bottom has a cold-air opening (5) with upwardly and inwardly inclined walls (6), over which a conical deflector (7) is supported and spaced by strips (7*). A hot-air pipe (9), supported by a brace (8), is downwardly turned at its inner end (10) above the deflector and perforated at (11) for air entry. A fuel pipe (12) runs through the air pipe, ending at the center of the turned portion. A small water pipe (13) enters the air pipe's outer end, vaporizing water into the mixture. A regulating valve on a union (15) uses a spring-loaded spindle (16) with a transverse bore (17), controlled by a bifurcated lever (20), to admit oil and permit sediment to pass. Cold air through opening (5) forces the deflected flame upward.
Excerpt limitation. The supplied text omits part of the specification and does not establish the full drawing details, any claims' formal numbering/allowance record, or independent verification of dates or status.
Source: https://patents.google.com/patent/[US974795](/patent/US974795)/en
Generated 10/1/2026, 10:02:05 PM
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Litigation summary
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PTAB challenges
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Assignment history
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Prior art
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Obviousness
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Extensions
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Derivative works
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