Invalidity dossier
US 5745480
Added 9/23/2026, 4:11:38 PM
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Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview: US5745480A — Multi-rate wireless communications system
Source: https://patents.google.com/patent/[US5745480](/patent/US5745480)/en (excerpted fetch, 2026-09-23)
Bibliographic facts (as supplied): Application US08/681,191, filed 1996-07-22; priority date 1996-04-03; granted and published 1998-04-28. Inventors: Saman Behtash, Christopher Flores, Adel Ghanem. Original assignee: Adicom Wireless Inc.; current assignee listed as [[Samsung Electronics Co Ltd](/litigations/by-plaintiff/Samsung%20Electronics%20Co%20Ltd).](/litigations/by-plaintiff/Samsung%20Electronics%20Co%20Ltd.) Legal status listed as "Expired – Lifetime" (anticipated expiration 2016-07-22). The same source lists later reassignments (Silicon Valley Bank security interest; Carlson Wireless, Inc.; Carlson Wireless Technologies, Inc.; Samsung Electronics Co., Ltd.) — noted here only as record entries, not evaluated.
Purpose: The text states the invention "relates to wireless communications, and more particularly, to methods and systems that simultaneously support a plurality of distributed user terminals connected to a central base station, each user terminal provided on demand one of multiple bit rates at a negotiated Quality of Service (QOS)." It notes that wireless networks were mainly designed for voice with fixed bit rates, while wire-line networks (e.g., ATM) support voice, data, image, and video with differing bit rate requirements, creating demand for comparable wireless service.
Plain-language scope (per the excerpt): One embodiment uses CDMA in which each user is assigned a variable bit rate, a variable processing gain, a variable transmit power, and a unique fixed-rate spreading code, producing a constant-bandwidth signal received at a power level corresponding to the negotiated QOS. The disclosed approach tunes four factors — received signal energy per chip, spreading-code auto-correlation over chips per bit, other users' received energy per chip, and spreading-code cross-correlation over chips per bit — to support variable bit rates and negotiated QOS. The text says channels are "resized," distinguishing this from prior-art aggregation, and that fixed-bandwidth RF components may reduce equipment costs. FDD and TDD configurations are said to be possible; stated applications include wireless local loop, mobile cellular, and wireless multimedia access. Eight figures are listed (system diagram; user-terminal transmitter; base-station rate negotiation; rate-determination flowchart; first- and second-embodiment transceivers for terminal and base station).
What the excerpt does not establish: It does not provide claim language, the full specification or omitted text, prosecution history, the actual scope of any claim, or verification of assignments, dates, or legal status. No litigation, validity, or prior-art analysis is presented or implied here.
Generated 10/1/2026, 9:51:06 PM
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Litigation summary
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PTAB challenges
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Assignment history
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Prior art
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Obviousness
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Extensions
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Derivative works
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