Invalidity dossier
US 6334062
Portable communications and data terminal operating to optimize receipt of both incoming CDPD and AMPS messages
Current assignee: Cirrus Logic Inc
Added 9/23/2026, 7:05:13 PM
Active provider: DeepSeek · deepseek-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
US6334062B1 — Patent Overview
Title: Portable communications and data terminal operating to optimize receipt of both incoming CDPD and AMPS messages
Patent number: US6334062B1
Application number: US08/487,043
Inventor: Russell P. Cashman
Original assignee: Cirrus Logic Inc (later reassigned to Pacific Communication Sciences, Inc.); current assignee listed as Cirrus Logic Inc
Priority/filing date: 1995-06-07
Publication (grant) date: 2001-12-25
Legal status (as listed): Expired – Lifetime; anticipated expiration 2018-12-25
Classifications: H04W36/00, H04W68/00 (paging), H04W88/06 (multi-mode terminals)
Purpose (plain language): The patent concerns wireless portable subscriber stations that switch between data and voice modes. It addresses optimizing receipt of incoming messages in both the CDPD (Cellular Digital Packet Data) and AMPS (Advanced Mobile Phone Service) systems. CDPD is described as a packet-switched data service sharing AMPS transmission facilities non-intrusively, transparent to the AMPS network. The application includes a microfiche appendix containing Part 403 of the Cellular Digital Packet Data System Specification Release 1.0 ("Mobile Data Link Protocol"), incorporated by reference.
Scope elements described: The background explains CDPD network architecture — mobile data base station (MDBS 1), mobile end system (M-ES 2), mobile data intermediate system (MD-IS 3), intermediate systems, fixed end systems, and network management system (NMS 10). It describes cells, cell transfer independent of AMPS hand-off, airlink interface, connectionless network services, and the MNLP location protocol. It notes AMPS cellular data limitations (bandwidth, baud rate, signal loss).
What the excerpt does not establish: This excerpt contains no claims, no detailed description of the invention's elements, no drawings, and no specific prior-art references. It does not state the actual inventive scope beyond the title and field. Assignee/ownership statements are expressly noted as unverified assumptions by the source. No litigation, validity, or ownership analysis is addressed here.
Source: https://patents.google.com/patent/[US6334062](/patent/US6334062)/en
Generated 10/1/2026, 9:42:20 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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