Invalidity dossier
US 5808784
Lens array sheet surface light source, and transmission type display device
Current assignee: Dai Nippon Printing Co Ltd
Added 9/23/2026, 7:41:30 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: US5808784A
Title: Lens array sheet surface light source, and transmission type display device
Patent number: US5808784A
Assignee: Dai Nippon Printing Co., Ltd. (original and current assignee as listed)
Inventors: Rika Ando, Haruo Ono, Hisanori Ishida, Michiko Takeuchi, Toshikazu Nishio, Nobu Masubuchi
Key dates:
- Priority date: 1994-09-06 (claimed from JP6236017A)
- Additional priorities: 1995-05-18 (JP14238695A); 1995-06-12 (JP7167861A)
- Filing date: 1995-09-05
- Publication/grant date: 1998-09-15
- Anticipated expiration: 2015-09-05; status listed as "Expired – Lifetime"
Application number: US08/523,609
Purpose and plain-language scope:
The patent relates to a lens array sheet, a surface light source incorporating it, and a transmission-type display device using the same. According to the indexed terms in the supplied text, the disclosure addresses optical effects, distribution of light, periodic effects, and visual effects, with the aim of avoiding deteriorative effects and dispersion problems. The prior-art keywords listed are "lens array," "cluster," "array sheet," "light," and "lattice." The description references percolation methods, distribution methods, resins, ionizing radiation, liquid crystal substances, and manufacturing processes such as casting, coating, and sandblasting. A divisional/related application (US09/069,966, published as US5841572A) is noted with a 1998-04-30 priority claim.
Source: https://patents.google.com/patent/[US5808784](/patent/US5808784)/en
What the excerpt does not establish:
The supplied text is an excerpt only and omits the abstract, claims, and full description. Consequently, this overview cannot state the specific claim limitations, the exact structural configuration of the lens array, the precise problem solved, or the technical details of any embodiment. Classification information is truncated mid-entry (G02B6/0001). No legal conclusions as to validity, enforceability, or claim scope are made or implied.
Generated 10/1/2026, 9:41:54 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
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.