Invalidity dossier
US 5544222
Cellular digtial packet data mobile data base station
Current assignee: Cirrus Logic Inc
Added 9/23/2026, 7:26:21 PM
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Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US5544222A
Title (as listed): "Cellular digtial packet data mobile data base station" (spelling as given in the source).
Patent number / application: US5544222A; application US08/152,005, filed 1993-11-12; granted and published 1996-08-06; status listed as "Expired - Lifetime," with anticipated expiration 2013-11-12.
Priority date: 1993-11-12, also listed as the prior-art date.
Original assignee: Pacific Communication Sciences Inc. Current assignee field lists Cirrus Logic Inc, Conexant Systems LLC, and Commscope Connectivity LLC (per the source's assignee list; the source cautions the list may be inaccurate). Inventors named: Mark T. Robinson, Steven H. Gardner, Matt Wong, Seton P. Kasmir, Kumar Balachandran, Sue Graham, Gail Schjelderup, and Roy F. Quick, Jr.
Purpose and plain-language scope (from the supplied text): The invention "relates generally to wireless communication systems" and "more particularly... to cellular base stations supporting transmission and reception of data, fax, and voice signals." The background describes limitations of analog AMPS circuit-switched cellular data (narrow channel bandwidth, transmission errors limiting baud rate, and data loss from handoffs, fading, reflections, Rayleigh fading, and dead spots), the simplex limits of pagers, and the wire-bound nature of fax-modems. Prior-art keywords include board, transceiver, MDBS, boards, and controller board, indicating a hardware-board-oriented base-station architecture. Classifications include H04W88/08 (access point devices), H04W88/10 (multi-mode access points), H04W48/08, and H04W72/02 (selection of wireless resources).
What the excerpt does not establish: It does not include the claims, detailed description, or drawings, so the exact claimed scope, structural details, and operation of the mobile data base station cannot be verified from the supplied text. It does not establish the later assignment/ownership chain, legal status accuracy, validity, or any litigation. The background's discussion of prior systems is presented as context, not as an admission or finding by this analysis.
Source: https://patents.google.com/patent/[US5544222](/patent/US5544222)/en
Generated 10/1/2026, 9:42:05 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
Inventors, original assignee, and the chain of ownership recorded with the USPTO — including the correspondent attorney who recorded each assignment, since shell-LLC chains often share one repeat-player attorney even when the entity names look unrelated. Surfaces NPE / patent-troll patterns: shell-entity transfers, known asserters in the chain, repeat correspondent fingerprints, pre-litigation assignments, and bankruptcy fire-sales.
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.