Invalidity dossier
US 7206606
Added 9/23/2026, 12:10:28 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: US7206606B2
Title: Wireless communication including diversity transmission and reception
Patent number: US7206606B2 (application US10/516,936; pre-grant publication US20050181737A1)
Inventors: Kiyotaka Kobayashi, Yutaka Murakami, Masayuki Orihashi, Akihiko Matsuoka
Original assignee: Matsushita Electric Industrial Co., Ltd. The supplied record lists the current assignee as Redwood Technologies LLC.
Key dates (as listed): Priority date 2002-11-26; filing date 2003-11-26; publication date 2007-04-17; anticipated expiration 2023-11-26. Legal status is listed as "Expired - Lifetime."
Purpose: The invention relates to a communication method, transmission apparatus, and reception apparatus for wireless communications using multiple antennas in both transmission and reception—i.e., MIMO (Multiple-Input Multiple-Output). MIMO uses multiple antennas at both ends and transmits/receives independent signals simultaneously in the same band using multiple eigenvectors, increasing transmission capacity without increasing frequency bandwidth.
Plain-language scope: In the described approach, a transmission apparatus controls parameters of adaptive modulation processing based on the reception electric field strength of the entire system, as estimated in a reception apparatus. For example, when the overall reception electric field strength exceeds a predetermined threshold, the transmission apparatus increases the modulation level of M-ary modulation. The excerpt notes that reception electric field strength varies among channels in multi-channel communications such as MIMO, and that basing adaptive modulation on the overall system field strength can affect the modulation level. The excerpt also references diversity transmission/reception and space-time coding classifications (H04L1/02, H04L1/06, H04L1/0618; H04L5/023), consistent with the title.
What the excerpt does not establish: The excerpt is truncated and does not include the full claims, detailed embodiments, figures, or the complete specification. It therefore does not establish the precise claimed scope, the specific adaptive-modulation control logic, or how per-channel field-strength variation is resolved. No litigation, ownership-transfer analysis, validity determination, or prior-art assessment is made here.
Source: https://patents.google.com/patent/[US7206606](/patent/US7206606)/en
Generated 10/1/2026, 9:53:47 PM
Cases on file (0)
Specific litigation cases in our database that name US patent 7206606. The free-form analysis below may also discuss cases beyond this list.
No cases on file mention this patent. Upload a CSV or add a case manually in Admin → Manage litigation cases.
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.