Invalidity dossier
US 5648955
Method for power control in a TDMA spread spectrum communication system
Current assignee: Intel Corp
Added 9/23/2026, 4:29:04 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 — US5648955A
Title: Method for power control in a TDMA spread spectrum communication system
Patent number: US5648955A | Application number: US08/480,898
Inventor(s): Ryan N. Jensen, Logan Scott, Claude M. Williams
Original assignee: Omnipoint Corp | Current assignee (as listed): Intel Corp
Dates (per the source): Priority date 1993-11-01; filing date 1995-06-07; publication/grant date 1997-07-15; anticipated expiration 2014-07-15. Legal status listed as "Expired – Lifetime."
Purpose and plain-language scope: The title and classification data indicate the patent concerns controlling transmit power in a communication system that combines time-division multiple access (TDMA) with spread spectrum techniques. Classifications include H04B7/2618 (hybrid CDMA-TDMA), H04B7/2643 (TDMA) and H04W74/04–74/06 (scheduled channel access, including polling). The recorded prior-art keyword frequencies point to the core subject matter being a base station exchanging signals with user stations, with monitoring, response, fading and power/degradation effects recurring in the claims and description. The abstract keyword "cellular communication" appears in the abstract, indicating a cellular context. The analysis of the excerpt does not permit a reliable statement of the specific claim language or the exact power-control steps.
Source: https://patents.google.com/patent/[US5648955](/patent/US5648955)/en
What the excerpt does not establish: The supplied text is largely bibliographic and machine-generated indexing, not the patent's description or claims. It therefore does not establish the actual claims, the specific method steps, the detailed description, cited prior art, or the technical problem solved. The assignee entries, dates, and "expired" status are expressly flagged in the source as assumptions or non-legal conclusions. No statements are made here about litigation, ownership transfers, validity, or prior art.
Generated 10/1/2026, 9:50:47 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.