Invalidity dossier
US 708926
Added 9/21/2026, 9:36:32 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 7,089,26 A — "Vapor-Burner"
Title: Vapor-Burner
Patent number: US 708926A
Inventors: Cranmer S. Shattuc and Clark E. Shattuc, of Chicago, Illinois
Assignee: Individual (original and current assignee listed as Individual)
Filing date: December 26, 1900 (Serial No. 41,117)
Publication/grant date: September 9, 1902
Legal status: Expired – Lifetime (anticipated expiration 1919-09-09)
Classification: F23D 11/00, 11/36, 11/44
Purpose: To vaporize and burn heavier or other grades of hydrocarbon oils for cooking and heating, avoiding smoke and smell while producing intense heat with comparatively small fuel consumption. The inventors also aim for a burner that is simple, strong, durable, efficient, and relatively inexpensive to manufacture.
Plain-language scope (from the described embodiment and claims): A vapor-burner with a generating-chamber (semispherical, with a bottom having two openings for an oil-supply pipe and a vapor-outlet pipe) and an outwardly projecting shoulder or ridge on the generator bottom. A vapor-reservoir sits below the generator in communication with it. Interposed between generator and reservoir is a concave (convex-plate) spreader with a central opening and a flange that also has a shoulder engaging the ridge. A conical-ring burner mounts on the flange, engaging the generator at its top, and has circumferentially extending rows of jet-passages. An auxiliary generator with oil-cup, needle-valves (13, 17, 22) and handwheels regulate oil supply and vapor flow to main and secondary burners; the secondary burner is similarly convex with ribs and jet openings, closed at the top.
Source: https://patents.google.com/patent/[US708926](/patent/US708926)/en
What the excerpt does not establish: It does not establish any litigation, ownership transfers beyond the listed "Individual" assignee, validity, or prior-art comparisons. The provided text is explicitly an excerpt, with portions omitted (e.g., some full claim language and drawing details); therefore the complete claim scope, exact figure content, and any omitted specification matter are not established here.
Generated 10/1/2026, 10:02:01 PM
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Litigation summary
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Proceedings on file (0)
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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.