Invalidity dossier
US 8610340
Solid-state light emitting devices and signage with photoluminescence wavelength conversion
Current assignee: Feit Electric Co Inc
Added 9/23/2026, 12:56:45 PM
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Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US 8,610,340 B2
Title: Solid-state light emitting devices and signage with photoluminescence wavelength conversion
Source: https://patents.google.com/patent/US8610340/en
Key dates: Priority date 2010-10-05; application (US 13/253,031) filed 2011-10-04; published as US 2012/0086034 A1 on 2012-04-12; granted 2013-12-17; anticipated expiration 2031-10-04. Legal status listed as Active — the source notes this is an assumption, not a legal conclusion.
Parties: Inventors Xianglong Yuan, Jonathan Melman, Bing Dai, Gang Wang, and Charles Edwards; original assignee Intematix Corporation; current assignee listed as Feit Electric Co Inc.
Purpose: The text describes embodiments relating to solid-state light emitting devices and signage that use photoluminescence wavelength conversion to convert light from a solid-state emitter to a desired color. It frames this against known white LEDs, which combine a blue LED die with phosphor that absorbs part of the blue light and re-emits yellow, or green plus red, or green and yellow, or green and orange, or yellow and red light; the unabsorbed blue plus the phosphor emission appears near-white. The stated rationale is that the resulting color depends heavily on how much light the phosphor emits, since it is the combination of amount and wavelength of both phosphor-emitted and residual blue light that determines the resultant color — hence devices intended to produce a given color require control over that conversion.
Plain-language scope: In general terms, the patent concerns solid-state lighting and signage in which a phosphor (photoluminescent) material converts some emitted light to a different wavelength, rather than relying on the emitter's own color alone.
What the excerpt does not establish: It contains no claims text, so no claim scope, limitations, or breadth can be described. It provides no figures, no description of the wavelength-conversion component's structure or materials, no signage-specific details, and no examples. The excerpt is noted as partial, so omitted portions of the specification are not represented here. No litigation, ownership-transfer, validity, or prior-art analysis is offered.
Generated 10/1/2026, 9:53:22 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
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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.