Invalidity dossier
US 5655830
Added 9/23/2026, 1:45:21 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 — US5655830A
Title: Lighting device
Patent number: US5655830A
Application number: US08/424,146
Inventor: Charles R. Ruskouski
Dates:
- Priority date: 1993-12-01 (claimed from US08/160,583)
- Filing date: 1995-04-17
- Publication (grant) date: 1997-08-12
- Anticipated expiration: 2014-08-12
- Legal status as listed: Expired – Fee Related
Assignee information (as listed):
- Original assignee: General Signal Corp
- Current assignee (per listing): DLAC Inc; GB BUILDING SYSTEMS Corp; Hubbell Inc
- Later recorded assignments include GSEG LLC, G.B. Building Systems Corporation, DLAC Inc., Dual-Lite Inc., Wilmington Trust Company, and Hubbell Incorporated.
Purpose and plain-language scope:
Based only on the supplied text, the patent concerns a "lighting device." The prior-art keywords listed — "light emitting," "emitting diodes," "lighting device," "mounting base," and "lighting" — indicate the subject matter involves a lighting device with a mounting base and light emitting diodes. Classifications include illuminated signs/luminous advertising (G09F13/00, G09F13/04, G09F13/18), LED light sources and retrofit light sources (F21K9/00, F21K9/20, F21K9/23, F21K9/232), lighting device cooling/thermal arrangements (F21V29/00, F21V29/50, F21V29/502, F21V29/506, F21V29/70, F21V29/83), and globes/bowls/cover glasses (F21V3/00, F21V3/02). The classification F21Y2107/00 covers three-dimensionally disposed light-generating elements.
What the excerpt does not establish:
The excerpt does not include the claims, written description, or drawings, so the precise claimed scope cannot be stated. It does not establish litigation, validity, enforceability, or the accuracy/completeness of the assignment and legal-status listings (which the source expressly describes as assumptions, not legal conclusions). It does not establish details of the parent applications or cited prior art.
Source: https://patents.google.com/patent/[US5655830](/patent/US5655830)/en
Generated 10/1/2026, 9:52:53 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.