Invalidity dossier
US 5432907
Network hub with integrated bridge
Current assignee: Hewlett Packard Development Co LP
Added 9/23/2026, 2:39:13 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 5,432,907
Title: Network hub with integrated bridge
Patent number: US 5,432,907 A
Application number: US 07/881,931
Inventors: Jose J. Picazo, Jr. and William E. Steels (one assignment record lists "William E. Steele"; the source spells the name both ways)
Original assignee: Network Resources Corp. (a California corporation)
Current assignee (as listed): Hewlett Packard Development Co. LP; Compaq Dallas Inc
Priority/filing date: 1992-05-12
Publication/grant date: 1995-07-11
Legal status as listed: Expired – Lifetime (anticipated expiration 2012-07-11). The source states legal status is an assumption, not a legal conclusion.
Purpose and plain-language scope (from the supplied text):
The patent concerns a network hub with an integrated bridge. The excerpt identifies the invention as relating to data switching networks, star or tree networks (H04L 12/44), and interconnection of networks (H04L 12/46), with buffering arrangements using storage descriptors such as read or write pointers (H04L 49/90, H04L 49/901). Frequently indexed concepts include network data packets, addresses, buffers, memory, and filtering. Later applications claim priority to this patent, and the document was reassigned over time to Compaq entities and then to Hewlett-Packard Development Company, L.P.
What the excerpt does not establish:
The supplied text is an excerpt; the abstract, full description, and complete claims are not reproduced here. It therefore does not establish the specific claim limitations, the precise operation of the integrated bridge or buffering scheme, any prior-art discussion or citations, or the technical details of the management method and MIB references indexed in the text. It also does not establish inventorship corrections, actual legal status, or any litigation, validity, or ownership conclusions, which were not researched. No missing facts have been inferred.
Source: https://patents.google.com/patent/US5432907/en (fetched 2026-09-23)
Generated 10/1/2026, 9:52:06 PM
Cases on file (0)
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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.