Invalidity dossier
US 9538569
Added 9/23/2026, 1:42:41 PM
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Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
US9538569B2 — Concise Patent Overview
Title: Data transfer between wireless devices
Patent number: US9538569B2
Application number: US14/921,736
Inventors: Alan G. Carlton; Alexander Reznik
Current/Original Assignee: InterDigital Patent Holdings Inc
Priority date: 2008-12-23
Filing date: 2015-10-23
Publication date (grant): 2017-01-03
Anticipated expiration: 2029-12-22
Legal status: Active
Source: https://patents.google.com/patent/[US9538569](/patent/US9538569)/en
Purpose. The patent addresses cumbersome, multi-step file transfers between devices. The supplied text states that existing transfers via email or MMS, using GPRS or WLAN, remain fragmented, requiring adaptation between multiple implementations, which inhibits regular use "in spontaneous situations." It therefore proposes "a simplified and more intuitive approach to data transfer between devices."
Plain-language scope. Per the supplied definitions, a method controls data communication in wireless communications by: (1) detecting environment information relating to at least one candidate WTRU (wireless transmit/receive unit) operating in a local area associated with the WTRU; (2) receiving a user input via a user interface selecting data for transfer and/or an identified target WTRU; (3) processing the user input together with candidate-WTRU information; and (4) identifying at least one target WTRU from the candidate WTRUs based in part on the user input. Candidate-WTRU information is solicited through a lower layer; environment information identifies the target WTRU; and transmission instructions enable data transmission to it. Figures describe a sending/receiving WTRU, a wireless communication environment, a target discrimination algorithm, a communication method, physical layer security, and user inputs including directional indication of a target's location (FIG. 8) and transfer to multiple receiving devices (FIG. 9).
What the excerpt does not establish. The supplied text is explicitly an excerpt with omitted portions; it does not include the full claims, detailed description, or drawings. Therefore it does not establish claim scope or limitations, the number of claims, priority-chain details beyond those listed, enablement or validity, or any litigation. Litigation, ownership transfers, validity, and prior art were not researched per instructions.
Generated 10/1/2026, 9:52:54 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
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.