Invalidity dossier
US 436932
Injector
Added 9/23/2026, 8:29:48 PM
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Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US 436,932
Title: Injector
Inventor: Daniel Best, of San Leandro, Alameda County, California
Assignee: None stated in the supplied text
Patent date: September 23, 1890
Application filed: April 29, 1890 (Serial No. 349,948; "No model")
Publication date (per source listing): 1890-09-23
Purpose: The invention is an improved apparatus for injecting liquids, described as working "with more certainty and satisfaction" than injectors in which "the whole body of water is admitted at one point." It is also stated to be useful as a blast apparatus.
Plain-language scope: Steam, air, or gas under pressure enters through jet-nozzle A, which is fixed in one end of an exterior casing B. Water enters the casing through inlet passage C near the nozzle. Between the jet nozzle and discharge pipe D, in line with them, sits a single-piece pipe of increasing-diameter sections (E, E, E). Its smallest section has a bell-mouth opening receiving the nozzle's discharge; at its opposite end it expands (F) into the next larger section. Each expansion is flared like a bell-mouth and perforated with holes (G). Exterior screw-threads (H) on the pipe fit threads (I) inside the casing, allowing the pipe to be screwed up or down and adjusted relative to the jet nozzle. In operation, the jet draws water into the first section; as the body gains momentum, additional water is drawn in through the holes at each successive enlargement, gradually increasing the flow.
Claim (as printed): An injector consisting of a casing with a jet-nozzle fixed at one end in line with the casing axis and a discharge pipe at the opposite end, an inlet passage adjacent to the jet nozzle, in combination with the pipe formed in a single piece, with sections increasing in diameter from one end to the other and forming shoulders or offsets at their junctions, a bell-mouth opening into which the jet nozzle discharges, perforations through the offsets or shoulders opening into the larger section beyond, and screw-threads in the casing interior, substantially as described.
What the excerpt does not establish: It does not identify an assignee, any ownership transfer, litigation, or validity determination; nor does it establish the content, dates, or teachings of any prior-art reference.
Source: https://patents.google.com/patent/[US436932](/patent/US436932)/en
Generated 10/1/2026, 9:41:22 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
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Extensions
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Derivative works
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