Invalidity dossier
US 5943322
Communications method for a code division multiple access system without a base station
Current assignee: ITT Manufacturing Enterprises LLC
Added 9/23/2026, 5:51:31 PM
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Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US 5,943,322
Title: Communications method for a code division multiple access system without a base station
Patent number: US5943322A | Application: US08/644,658 | Filed / Priority: 1996-04-24 | Granted / Published: 1999-08-24 | Status (per source): Expired – Lifetime; anticipated expiration 2016-04-24
Inventors: Michael A. Mayor, Paul A. Gilmour | Original assignee: ITT Defense and Electronic Inc. The source also lists later assignees (ITT Manufacturing Enterprises LLC; Stingray IP Solutions LLC) as current, noting those listings "may be inaccurate" and that no legal analysis was performed.
Purpose: To provide personal communications for a network of radios in a CDMA system operated without a base station — described as especially suited to battlefield use, where losing a base station would otherwise render the network inoperable.
Plain-language scope (per the supplied text):
- A communications channel spread by a PN code is transmitted simultaneously with a control channel spread by a different PN code.
- Addressing restricts communications to radios permitted in the network; PN codes identify the network, each radio, and the conversation mode.
- One radio becomes a network control station, initiating communications and maintaining power control and time synchronization as a base station normally would; control can be voluntarily or commandably transferred to another radio.
- The control channel carries power-control information so radios near the control station do not overwhelm distant radios.
- Conversational mode uses receivers with parallel despreaders, letting the control station simultaneously receive from and respond to multiple radios.
- Voice and data may be spread with different PN codes and distinguished by despreaders.
- Operation uses time division duplexing in a CDMA system (FIGS. 1A–1C, 2, 3).
Source: https://patents.google.com/patent/US5943322/en
What the excerpt does not establish: It does not provide claim language, the full description, the exact number or wording of claims, the complete list of cited prior art, the figures' contents, or an independent verification of legal status or assignee accuracy; the legal-status and assignee entries are explicitly characterised in the source as assumptions, not conclusions.
Generated 10/1/2026, 9:43:15 PM
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Litigation summary
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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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