Invalidity dossier
US 6529824
Personal communication system for communicating voice data positioning information
Current assignee: American Calcar, Inc.
Added 8/27/2026, 12:47:16 AM
Active provider: DeepSeek · deepseek-v4-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
US6529824B1 — Concise Overview
Title: Personal communication system for communicating voice data positioning information
Patent number: US6529824B1
Application number: US09/669,527
Filing date: 2000-09-25
Publication/grant date: 2003-03-04
Priority date (as listed): 1997-06-20
Inventor(s): Michael L. Obradovich, John Dinkel, Michael Kent
Original assignee: American Calcar Inc.
Current assignee (as listed): Silver State Intellectual Technologies Inc.
Legal status (as listed): Expired – Lifetime; anticipated expiration 2017-06-20
Classifications (representative): H04W4/02, H04W4/024; G01C21/20, G01C21/26, G01C21/34, G01C21/36, G01C21/3667, G01C21/3885, G01C21/3889, G01C21/3896; G08G1/09, G08G1/0962, G08G1/0968, G08G1/0969
Prior-art keywords listed: map data, data, pcd, map, information
Purpose and plain-language scope. Based only on the supplied text, the patent is directed to a personal communication system that communicates voice data positioning information. Its title and classification tags situate it in wireless location-based services, navigation, electronic maps, route guidance, and transmission of map data to and from client devices (including central-database map transmission and selected/route-dependent map data). Accordingly, the apparent scope covers conveying positioning information by voice and delivering map/navigation data to a user device.
Citation: https://patents.google.com/patent/[US6529824](/patent/US6529824)/en
What this excerpt does not establish. The supplied material contains no abstract, description, or claims, so it does not establish the actual claimed elements, claim breadth, embodiments, or the meaning of the keyword "pcd." It also does not establish validity, enforceability, inventorship correctness, or the accuracy of any listed legal-status or assignee entries; the source itself notes these are assumptions, not legal conclusions.
Generated 10/1/2026, 10:03:46 PM
Cases on file (1)
Group view →Specific litigation cases in our database that name US patent 6529824. The free-form analysis below may also discuss cases beyond this list.
- American Calcar, Inc. v. BMW of North America, LLCfiled Mar 25, 20043:04-cv-00614U.S. District Court, Southern District of Californiaterminated Apr 19, 2006closed
Defendants: BMW of North America, LLC
Other patents asserted: 6009355, 6148261, 6275231, 6282464, 6330497, 6438465, 6459961, 6542795, 6587758, 6587759, 6703944
Litigation summary
Past and pending lawsuits — plaintiffs, defendants, jurisdictions, outcomes, and notable rulings.
Proceedings on file (0)
All PTAB activity →AIA trial proceedings (IPR / PGR / CBM) filed at the USPTO Patent Trial and Appeal Board against this patent. Sourced from the USPTO Open Data Portal and refreshed every six hours; each proceeding number deep-links to the PTAB E2E docket.
Current assignee: American Calcar, Inc.
No PTAB proceedings on file. This patent has not been challenged via IPR, PGR, or CBM. The absence is itself a signal — well-asserted patents eventually attract IPRs. The LLM analysis below may surface filings the ODP feed hasn’t indexed yet.
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
Earlier patents, publications, and products that may anticipate or render the claims unpatentable.
Obviousness
Combinations of prior art that suggest the claimed invention would have been obvious under 35 U.S.C. § 103.
Extensions
Patent term adjustments, term extensions, continuations, divisionals, family members, and expiration dates.
Derivative works
Defensive disclosure: derivative variations of each claim designed to render future incremental improvements obvious or non-novel.
Keep exploring
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This patent in court (1)
1 tracked lawsuit name US 6529824.