Invalidity dossier
US 7113129
Blind signal separation using a combination of correlated and uncorrelated antenna elements
Current assignee: InterDigital Technology Corp
Added 9/24/2026, 2:13:56 AM
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Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US 7,113,129 B2
Title: "Blind signal separation using a combination of correlated and uncorrelated antenna elements"
Patent number / application: US 7,113,129 B2; Application No. US 11/233,300.
Inventor / assignee: Inventor Steven J. Goldberg; original assignee InterDigital Technology Corp. (current assignee listed as InterDigital Technology Corp. — Google notes assignee listings may be inaccurate).
Key dates: Prior art date and priority date 2004-09-23; filing date 2005-09-22; publication date 2006-09-26; publication of US20060066481A1 on 2006-03-30. Anticipated expiration 2025-09-22. Legal status: "Expired - Fee Related" (stated as an assumption, not a legal conclusion).
Purpose: The invention concerns signal processing, specifically separating desired source signals from a mixture of source signals using blind signal separation (BSS). BSS recovers source signals from a composite signal containing a mixture, and is "blind" because it operates with limited information about the signals, their sources, and propagation-channel effects. The excerpt describes a problem with prior approaches (U.S. Pat. Nos. 6,799,170 and 6,931,362): as the number of sources M grows, so must the number of sensors N (N ≥ M), which is impractical for small portable communications devices with limited volume. The stated aim is a communications device with a compact antenna array that receives a mixture of source signals for use by BSS techniques, allowing separation of desired source signals without requiring spatially separated sensors each supplying a single input.
Plain-language scope (from the excerpt): A communications device separates signals from M sources using an antenna array receiving different summations of those signals; a receiver connects to the array, and a blind signal separation processor builds a mixing matrix from those summations and separates desired source signals from it. The excerpt mentions techniques including PCA, ICA, and SVD, and ends mid-sentence: "a compact antenna array may be used instead…" Full claim language is not present in the excerpt, so the precise claimed scope cannot be stated here.
What the excerpt does not establish: The actual claims, dependent-claim limitations, the specific arrangement of correlated versus uncorrelated antenna elements, exact element counts/geometry, and the complete specification are not included. It also does not establish legal status, validity, or enforceability.
Generated 10/1/2026, 9:40:48 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
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Prior art
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Obviousness
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Extensions
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Derivative works
Defensive disclosure: derivative variations of each claim designed to render future incremental improvements obvious or non-novel.