Invalidity dossier
US 7945544
Similarity-based access control of data in a data processing system
Current assignee: Personalweb Technologies LLC
Added 9/23/2026, 6:11:41 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 7945544 B2
Title: Similarity-based access control of data in a data processing system
Patent number: US7945544B2
Application number: US11/980,688 (filed 2007-10-31)
Priority date: 1995-04-11 (listed as an assumption, not a legal conclusion)
Publication date: 2011-05-17
Inventors: David A. Farber; Ronald D. Lachman
Original assignees: Level 3 Communications LLC; Kinetech Inc
Current assignee (as listed; stated to be potentially inaccurate): PersonalWeb Technologies LLC; Level 3 Communications LLC
Legal status (as listed, not a legal conclusion): Expired – Fee Related, expires 2016-12-25
Other version: US20080065635A1
Purpose and plain-language scope
The supplied text identifies the invention as "similarity-based access control of data in a data processing system." The listed prior-art keywords — "file," "data item," "value," "parts," "true" — suggest subject matter concerning data items, their values, and parts thereof, but the excerpt provides no claims, abstract, or description to define the actual scope. Accordingly, no reliable plain-language statement of the claimed scope can be drawn from the supplied text alone.
Source
https://patents.google.com/patent/US7945544/en
What the excerpt does not establish
The provided text contains no claims, abstract, specification, or drawings. It therefore does not establish:
- The actual claimed subject matter or claim limitations
- How "similarity" or "access control" is defined or implemented
- The relationship between the two listed current assignees
- Whether the priority date, legal status, or assignee listing are accurate (the source itself labels several of these as assumptions)
- Any substantive connection between the listed prior-art keywords and the invention
Litigation, ownership transfers, validity, and prior art are outside the scope of this overview and of the excerpt.
Generated 10/1/2026, 9:42:57 PM
Cases on file (0)
Specific litigation cases in our database that name US patent 7945544. The free-form analysis below may also discuss cases beyond this list.
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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.