Invalidity dossier
US 7428669
Adaptive FEC codeword management
Current assignee: Adaptive Spectrum and Signal Alignment, Inc.
Added 9/24/2026, 12:48:05 AM
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Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US7428669B2
Title: Adaptive FEC codeword management
Patent number: US7428669B2
Application number: US10/795,593 (filed 2004-03-08)
Priority date: 2003-12-07
Publication date (grant): 2008-09-23 (earlier publication as US20050138524A1, 2005-06-23)
Inventor: John M. Cioffi
Current assignee (as listed): Adaptive Spectrum and Signal Alignment Inc (original assignee; assignment recorded 2004-12-06)
Legal status (as listed): Expired – Lifetime; adjusted expiration 2025-09-21
Purpose and plain-language scope: The patent concerns adaptive management of forward error correction (FEC) codewords in digital transmission. Its classifications place it in error detection/prevention using forward error control and block codes (H04L1/0056, H04L1/0057), in adapting transmission characteristics to link quality—specifically channel coding and rate adaptation via statistical/mode-switching strategies (H04L1/0009, H04L1/0015, H04L1/0019)—and in line transmission with crosstalk reduction (H04B3/32), plus interleaving (H04L1/0071). Prior-art keywords listed are "controller," "ccr," "fec," "transmission," and "codeword." In plain terms, the disclosed subject matter appears directed to a controller that adjusts FEC codeword parameters in response to changing transmission conditions. A family exists with litigation and a PTAB case (IPR2025-00395) noted; no details are supplied.
Source: https://patents.google.com/patent/[US7428669](/patent/US7428669)/en
What the excerpt does not establish: The supplied text contains only bibliographic, classification, and prosecution-history metadata and images; it does not include the abstract, specification, or claims. Therefore this overview cannot state the actual claimed invention, its limitations, the meaning of "ccr," any specific adaptive algorithm, or the technical problem solved. Dates, assignee, legal status, and classifications are as listed on the source and are not independently verified; no litigation, ownership-transfer, validity, or prior-art analysis is provided here.
Generated 10/1/2026, 9:31:50 PM
Cases on file (1)
Group view →Specific litigation cases in our database that name US patent 7428669. The free-form analysis below may also discuss cases beyond this list.
- Adaptive Spectrum and Signal Alignment, Inc. v. AT&T Inc. et al.filed Jan 19, 20242:24-cv-00029U.S. District Court for the Eastern District of Texas, Marshall Divisionterminated Apr 14, 2025dismissed - settled
Defendants: AT&T Inc., AT&T Corp., AT&T Communications, LLC, and 3 others
Other patents asserted: 7593458, 7809996, 7991122, 9954631, 10848398, 11050654, 11477108, 11770313
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.
Current assignee: Adaptive Spectrum and Signal Alignment, Inc.
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.
Keep exploring
More patents asserted by Adaptive Spectrum and Signal Alignment, Inc.
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This patent in court (1)
1 tracked lawsuit name US 7428669.