Invalidity dossier
US 5857147
Method and apparatus for determining the transmission data rate in a multi-user communication system
Current assignee: Qualcomm Inc
Added 9/21/2026, 10:43:23 AM
Active provider: DeepSeek · deepseek-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
US5857147A — Patent Overview
Title: Method and apparatus for determining the transmission data rate in a multi-user communication system
Patent number: US5857147A
Application number: US08/575,049
Assignee: Qualcomm Inc (original and current assignee listed)
Inventors: William R. Gardner; Paul E. Jacobs; Roberto Padovani; Noam A. Ziv; S. Katherine Lam; Andrew P. DeJaco
Priority date: 1993-09-08
Filing date: 1995-12-20
Publication/grant date: 1999-01-05
Legal status as listed: Expired – Lifetime (anticipated expiration 2013-09-08)
Purpose (plain language): The patent concerns determining the data rate used for transmission in a communication system shared by multiple users. It addresses how transmission characteristics can be adapted based on link conditions and how the source coding can be adjusted accordingly, along with signaling of the mode or rate. It also touches on traffic management in a multi-user setting, including rate modification at the source after receiving feedback, and on variable-rate vocoder operation where mode decisions depend on audio signal content versus external parameters.
Scope indicated by the supplied classifications: The excerpt lists classifications including H04W28/18 and H04W28/22 (negotiating wireless communication parameters and communication rate), H04L1/0014 (adapting the source coding according to link quality), H04L47/263 (rate modification at the source after receiving feedback), H04L47/38 (adapting coding or compression rate), and G10L19/22 (vocoder mode decision based on audio content versus external parameters).
What the excerpt does not establish: The supplied text is an excerpt only. It does not reproduce the claims, abstract, or detailed description, so the precise claimed scope, the specific novelty over prior art, and the operational details described in the specification cannot be determined from this material. It also does not establish litigation, ownership transfers, validity, or the content of any cited prior art.
Source: https://patents.google.com/patent/[US5857147](/patent/US5857147)/en
Generated 10/1/2026, 10:01:10 PM
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Litigation summary
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Proceedings on file (0)
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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.