Invalidity dossier
US 7142878
Added 9/23/2026, 12:08:38 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 7,142,878 B1 — "Method of timing calibration"
Title: Method of timing calibration
Patent number: US 7,142,878 B1
Application number: US09/439,217 (filed 1999-11-12)
Priority date: 1999-11-12
Publication (grant) date: 2006-11-28
Original assignee: Lucent Technologies Inc.
Inventors: Christopher Burke Barroso, Byron Hua Chen, Giovanni Vannucci
Legal status as listed: Expired – Fee Related (anticipated expiration 2019-11-12)
Purpose and plain-language scope (per the supplied text):
The patent relates generally to wireless communications systems, and in particular to geographical location using such systems. The background describes satellite-based navigational systems, exemplified by the Global Positioning System (GPS), in which a receiver detects GPS signals by correlating replicated PN codes and carrier signals across a frequency spectrum and code-phase spectrum. Detection is described as slow and difficult when the receiver lacks a clear view of the sky. Wireless assisted GPS (WAG) systems are described as addressing this by narrowing the frequency and code-phase ranges searched during "search windows." A WAG system is described as including a WAG server with a GPS antenna at a known, stationary location, base stations of known location serving cells, and a WAG client (a GPS receiver, possibly with a mobile telephone) typically in motion or at an unknown location. The disclosed subject matter is titled as a method of timing calibration; consistent with the title, the described context involves calibrating timing to support the narrowed searches. The excerpt does not set out the calibration method's steps, claims, or the specific calibrated quantity.
Source URL: https://patents.google.com/patent/US7142878/en
What the excerpt does not establish:
The supplied text is explicitly an excerpt with omitted material. It does not provide any patent claims, a full written description, the specific steps of the timing-calibration method, or any prior-art references. The title, classifications, and background context above are drawn from the supplied source text; nothing about the claims' actual scope, validity, enforceability, or ownership history should be inferred beyond the bibliographic data quoted here. The listed assignees and legal status are as stated in the source, which notes they are assumptions rather than legal conclusions.
Generated 10/1/2026, 9:53:49 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
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.