Invalidity dossier
US 7386332
Mobile terminal device
Current assignee: Hitachi Ltd
Added 9/23/2026, 8:50:01 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 7,386,332 B2
Title: Mobile terminal device
Patent number: US 7,386,332 B2
Application number: US 10/888,335
Assignee: Hitachi, Ltd. (original and current assignee of record; inventors Kozo Masuda and Ikuya Arai)
Priority date: 2004-02-05
Filing date: 2004-07-09
Publication date (grant): 2008-06-10
Earlier publication: US 2005/0176471 A1 (2005-08-11)
Legal status as listed: Expired – Fee Related, adjusted expiration 2024-09-08
Source: https://patents.google.com/patent/US7386332/en
Purpose. The patent addresses heat accumulation in mobile terminals. The excerpt states the invention "can provide a mobile terminal device capable of reducing heat accumulation," and criticizes prior arrangements in which a heat sink protrudes externally (affecting portability and appearance) or is exposed only to a limited degree, and in which exposing the heat sink required a separate, non-interlocked slide operation.
Plain-language scope. The device has a first case with a display unit and a second case with an input unit, arranged to slide relative to one another, plus a heat radiation member that radiates heat generated in either case. The heat radiation member has a surface area exposed outside that "is changed in connection to the slide operation" of the two cases—so sliding the device itself alters how much heat-radiating surface is exposed. Figures cover a block diagram, external views, cross-sections, and application CPU periphery; the description also discusses temperature detection, open/close detection, and open/close operation control, and notes applicability to mobile telephones, PHS, PDA, notebook PCs, mobile TV, and mobile video recording/reproduction devices.
What the excerpt does not establish. It contains no claim text, so the exact claimed scope cannot be confirmed. It does not establish the full description, all drawing content, examination history, or the accuracy of the listed legal status (Google itself labels status and dates as assumptions, not legal conclusions). The excerpt also does not describe the cited prior-art documents beyond brief characterizations, and it does not establish litigation, ownership transfers, or validity.
Generated 10/1/2026, 9:41:08 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.