Invalidity dossier
US 6895507
Added 9/24/2026, 2:14:45 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 6,895,507 B1
Title: Method and system for determining and maintaining trust in digital data files with certifiable time
Patent number: US 6,895,507 B1
Application number: US09/609,646
Inventor: Steven W. Teppler
Original/current assignee (per source): Time Certain LLC
Priority date: 1999-07-02
Filing date: 2000-07-03
Publication (grant) date: 2005-05-17
Legal status (as listed): Expired – Fee Related; adjusted expiration 2022-08-23
Purpose. The patent concerns establishing and maintaining trust in digital data files by associating them with certifiable time. The classification listing places it in H04L9/32 and H04L9/3297 — cryptographic arrangements for identity/authority verification, data integrity, non-repudiation, and specifically time stamps. The abstract/claim keywords supplied are: time, user, digital data, data file, identifier. The "Prior art date" field is given as 1999-07-02.
Plain-language scope (based only on supplied text). The excerpt supports only a high-level characterization: the invention relates to determining and maintaining trust in digital data files through certifiable time, involving a user, a data file, and an identifier, and implicating verification and modification concepts appearing in the claim and description term listings. Related family filings are listed: US11/129,651 (published as US7409557B2) and US12/185,645 (published as US8868914B2).
Source: https://patents.google.com/patent/US6895507/en
What the excerpt does not establish. The supplied text does not reproduce the actual claims, abstract, or detailed description; it provides bibliographic data, classifications, and a term-frequency listing only. It also does not establish the precise scope of any claim, the specific algorithms or hardware used, claim count or dependencies, whether the listed "prior art keywords" are claim terms, or the accuracy of the assignee/status fields (the source itself disclaims legal conclusions as to status, priority, and assignee). No litigation, ownership-transfer, validity, or prior-art analysis is included.
Word count: ~250.
Generated 10/1/2026, 9:40:47 PM
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Litigation summary
Past and pending lawsuits — plaintiffs, defendants, jurisdictions, outcomes, and notable rulings.
Proceedings on file (0)
All PTAB activity →AIA trial proceedings (IPR / PGR / CBM) filed at the USPTO Patent Trial and Appeal Board against this patent. Sourced from the USPTO Open Data Portal and refreshed every six hours; each proceeding number deep-links to the PTAB E2E docket.
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
Earlier patents, publications, and products that may anticipate or render the claims unpatentable.
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.