Invalidity dossier
US 5224120
Dynamic capacity allocation CDMA spread spectrum communications
Current assignee: InterDigital Technology Corp
Added 9/21/2026, 10:40:50 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 5,224,120 A
Title: "Dynamic capacity allocation CDMA spread spectrum communications"
Inventor: Donald L. Schilling
Assignee of record in the excerpt: InterDigital Technology Corp. (original assignee); earlier assignment to SCS Mobilecom, Inc. recorded 1992-07-23, then to InterDigital Technology Corp. recorded 1993-03-12.
Application number: US 07/891,135
Filing date: 1992-06-01
Publication/grant date: 1993-06-29
Priority date (assumed): 1990-12-05, from US 07/622,235
Status listed: Expired – Lifetime; anticipated expiration 2010-12-05
Source: https://patents.google.com/patent/US5224120/en
Purpose (per the supplied text): The invention relates to spread spectrum communications, and specifically to dynamically allocating power and capacity in spread spectrum communications to prevent interference to a radio-relay system — such as a microwave relay system — or to a cellular communications system conforming to the AMPS or IS54 standards. The disclosure refers to either system as a "radio relay system." Such radio-relay systems, whether using digital and/or analog transmission, have interference requirements; for digital systems the effect of interference on a victim digital receiver is described primarily as threshold degradation.
Plain-language scope: At a high level, the patent addresses managing transmission power and channel/capacity allocation in a CDMA (code division multiple access) spread spectrum system so that the spread spectrum operation does not unacceptably interfere with an existing relay or cellular system. Classifications in the excerpt are consistent with this framing: H04W52/34 and H04W52/346 (sharing limited transmission power among users/channels and distributing total power among users), H04W52/343 (accounting for loading/congestion), H04B7/216 (CDMA/SSMA), and H04B1/707 (direct-sequence spread spectrum).
What this excerpt does not establish: It does not provide the claims, the detailed description's algorithms or structural elements, any prior-art references, or the exact interference-avoidance mechanism. It does not establish litigation, ownership beyond the recorded assignments shown, validity, or claim scope. The priority date and legal status are expressly noted in the source as assumptions, not legal conclusions.
Generated 10/1/2026, 10:01:20 PM
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Litigation summary
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Proceedings on file (0)
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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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