Invalidity dossier
US 5873108
Personal information manager information entry allowing for intermingling of items belonging to different categories within a single unified view
Current assignee: GOYAL JAI
Added 9/24/2026, 1:46:43 AM
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 5,873,108 A
Title: Personal information manager information entry allowing for intermingling of items belonging to different categories within a single unified view
Patent number / application: US 5,873,108 A; application US 08/728,178, filed 1996-10-19.
Dates: Priority date 1995-02-27; granted/published 1999-02-16; anticipated expiration 2015-02-27. Legal status listed as "Expired – Fee Related."
Assignee / inventors: Original assignee Fuga Corp; inventors Jai Goyal and Jean Tze-Yin Pang Goyal. A 2002-02-04 reassignment to Goyal, Jean Tze-Yin Pang and Goyal, Jai (assignors: Fuga Corporation) is noted in the source; current assignee listing shows the inventors. (Per instructions, no analysis of ownership transfers is offered.)
Purpose: The invention relates to personal information managers — devices for organizing appointments, expenses, telephone and address information, and lists including to-do lists. It addresses the complexity of prior-art managers, which required separate sections and operational modes. The disclosed manager is application-specific, performing calendar, telephone, and list functions in "a single, consistent, simple way," presenting one main screen.
Plain-language scope: The manager uses a "tag paradigm": different types of information are entered and retrieved from a single screen in a consistent manner, with no separate sections, largely eliminating modes. A column of lines labelled "TAG" on the main screen is used to enter a tag for most entries. The description covers entering to-dos, appointments, and expenses on one screen; retrieving them consistently; and viewing a day's or week's appointments, to-dos, expenses, and logs at a glance. Figures show entry, tag, text, repeat, calculator, reminder, retrieval, telephone/address, and list screen displays, plus logical structures and data entry/display flow charts. The described device is a hand-held, pen-based computer (PDA) with an LCD touch-screen and stylus, though the invention is stated to apply to personal information manager software on various computing devices.
Source: https://patents.google.com/patent/US5873108/en
What the excerpt does not establish: It does not reproduce the claims, so the precise scope of legal protection is not established. The excerpt is also explicitly incomplete ("consult the source for omitted text"), and it provides no prior-art references, litigation, validity, or detailed transfer information. Classification entries are truncated/incomplete, and no detailed description text beyond the excerpts above is available.
Generated 10/1/2026, 9:31:09 PM
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Litigation summary
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Proceedings on file (0)
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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
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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.