Invalidity dossier
US 5935000
Added 9/23/2026, 1:30:20 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 — US 5,935,000
Title: Secure gaming ticket and validation method for same
Inventors: Cayetano Sanchez, III; Walter Szrek
Assignee (per source listing): Original assignee IGT Rhode Island LLC; Current assignee listed as IGT Canada Solutions ULC. The source also records an assignment to GTECH Rhode Island Corporation and later to SPIELO International Canada, ULC.
Key dates: Priority/filing date 1998-03-04; publication/grant 1999-08-10; legal status "Expired – Lifetime," with anticipated expiration 2018-03-04. PCT filing 1999-03-02 (WO1999044704A1).
Purpose: The invention addresses lottery ticket security. The source states the present invention "provides a lottery ticket and system which allows for 'one pass' keyless validation of instant gaming tickets in a highly secure manner," and that separating validation information between a first location (such as a host computer) and a second location (the ticket itself) limits tampering and "will significantly reduce lottery fraud."
Plain-language scope: Validation information is stored at one location and ticket identification information or prize information data at another. These are encoded to create "interim" data, which is combined with the remaining data element to create a "validation signature" that determines a ticket's win status. The system may also describe ticket layout information or other secret data, and may be used for probability game tickets in which players remove latex from only limited covered spaces. Implementations may vary the validation information, signature, encoding, or combining step as functions of ticket identification, prize data, book ranges, or different games. The disclosed combination includes a gaming ticket (bearing ticket identification information and prize information data) plus a validation device storing validation information.
Source: https://patents.google.com/patent/US5935000/en (fetched 2026-09-23).
What the excerpt does not establish: It does not establish litigation, ownership-transfer validity, patent validity, or prior-art comparisons. The provided text is an excerpt; omitted portions (including full claim language, figures, and detailed description) are not represented here, and nothing above should be read as a legal conclusion.
Generated 10/1/2026, 9:53:06 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.