Invalidity dossier
US 7724720
Method for transmitting a sequence of symbols
Current assignee: Nokia Technologies Oy
Added 9/21/2026, 9:42:29 AM
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 7,724,720 B2
Title: "Method for transmitting a sequence of symbols"
Patent number / application: US 7,724,720 B2, from application US 11/457,879, filed 2006-07-17; granted 2010-05-25. Priority date listed as 1999-07-09. An earlier publication, US 2006/0245409 A1, issued 2006-11-02.
Inventor(s) named: Sari Korpela, Janne Koivisto, and Kaj Jansen. Original assignee: Nokia Inc.; later assignment to Nokia Corporation appears in the record, and the page lists Nokia Technologies Oy and Vringo Infrastructure Inc. among current assignees. Legal status shown as "Expired – Fee Related."
Field / purpose (per the supplied text): The invention relates generally to transmitting a certain sequence of symbols, and more particularly to diversity transmissions in which symbols of the sequence are sent using at least two antennas. The background discusses WCDMA cellular systems, synchronization channels (primary and secondary synchronization codes), frames and time slots, and spreading codes (a long scrambling code C_S and a short channelization code C_C). It emphasizes that a receiver must be able to determine transmitted synchronization symbols correctly, otherwise it may fail to identify transmission diversity and encoding schemes in use.
Plain-language scope (as far as the excerpt shows): The patent concerns sending symbol sequences over multiple antennas in a diversity arrangement, in a radio context where synchronization information and diversity schemes must be reliably detectable by the receiver. The supplied excerpt does not include the claims, so the precise claimed scope cannot be stated here.
Source: https://patents.google.com/patent/US7724720/en
What the excerpt does not establish: the actual claim language or claim count; the detailed embodiments; the specific figures beyond brief descriptions (FIG. 1: WCDMA cell; FIG. 2: common channels); the full abstract and description (the text is explicitly marked as excerpted). It also does not establish validity, enforceability, or the accuracy of assignee/status listings.
Analyst note: this overview relies only on the supplied source text; omitted portions should be consulted for complete scope.
Generated 10/1/2026, 10:01:56 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.