Invalidity dossier
US 5664862
Edge light for panel display
Current assignee: Miyakawa Corp
Added 9/23/2026, 2:44:28 PM
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Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview: US5664862A — "Edge Light for Panel Display"
Source: https://patents.google.com/patent/[US5664862](/patent/US5664862)/en (excerpted; consult source for omitted text)
Identification and dates. US5664862A (application US08/694,833) is titled "Edge light for panel display." The earliest priority date listed is 1994-11-29. The application was filed 1996-08-09 and the patent granted/published 1997-09-09. The listing shows an anticipated expiration of 2014-11-29 and a current legal status of "Expired – Fee Related" (expressly an assumption, not a legal conclusion).
Parties. Inventors listed are William Franklin Redmond, Richard Edward Dunah, and Yong Qiao. The original assignee is Precision Lamp Inc. The "current assignee" fields list Miyakawa Corp and Credit Managers Association of California; the assignment entries show a 1998-09-11 assignment to Miyakawa Corporation from Credit Managers Association of California, and a 1998-09-14 assignment to Credit Managers Association of California from Precision Lamp, Inc.
Purpose and plain-language scope. The prior-art keywords—light, shaped surface, end portion, elongate portion, facets—indicate an edge-lighting device that couples light into a panel display from its side. Consistent with that, the classifications cover light guides (G02B6/00 family), including plate-like guides, coupling-in features such as a shaped or recessed guide portion that houses at least part of the light source (G02B6/0021), tapered guides (G02B6/0028), coupling-out features, reflective sheets (G02B6/0055), plural/multi-colour sources (G02B6/0068), and edge-illuminating backlights for liquid-crystal displays (G02F1/133615). The ornamental/classification grouping also references illumination for oven cavities (F24C15/008). In plain terms, the disclosure concerns an elongate edge-light structure with shaped surfaces or facets that distributes source light across a display panel.
What the excerpt does not establish. The supplied text contains no claims, no detailed description, no drawings, and no cited prior-art references. It therefore does not establish the specific claimed structure, claim scope, embodiments, materials, dimensions, or how the shaped surfaces/facets function optically. No statement here addresses validity, infringement, or litigation.
Generated 10/1/2026, 9:52:02 PM
Cases on file (0)
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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
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Extensions
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Derivative works
Defensive disclosure: derivative variations of each claim designed to render future incremental improvements obvious or non-novel.