Invalidity dossier
US 8121613
Added 9/23/2026, 1:45:33 PM
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Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview: US8121613B1
Title: Method and system for obtaining emergency caller location
Patent number: US8121613B1
Application number: US12/205,883
Filed: 2008-09-07
Granted/Published: 2012-02-21
Priority date (as listed): 2005-07-14
Inventors: Chi Fai Ho; Shin Cheung Simon Chiu
Original assignee: TP Lab Inc
Current assignee (as listed): Lab Technology LLC
Legal status (as listed): Active, adjusted expiration 2029-04-21
Purpose (per the supplied text): The invention "relates generally to telecommunications, more specifically, to a method and system to provide location information for voice calls." It addresses the problem that when a caller dials 911, emergency dispatchers need the caller's location—especially when the caller (a child, an ill or injured person) cannot communicate it. In traditional residential service, the subscription's location is the access-line connection point, typically the subscriber's street address; the service provider submits the telephone number and location to an Automatic Location identity (ALI) database, which maps number to location. A 911 selective router uses the ALI record to pick a Public Safety Answering Point (PSAP), and the PSAP retrieves the location again to inform the agent.
The stated danger is VoIP: an IP telephone may be moved to a neighbor's broadband gateway or a hotel's IP network, so the ALI-based assumption that the caller is at the subscribed address can fail, potentially delaying emergency response.
Plain-language scope: Embodiments cover systems and methods for obtaining a caller's location during a telephone call. A phone system obtains the subscriber access line identity of a subscriber access line and sends it to a subscriber location query system, which returns a subscriber location or subscriber location record. Subscriber phone equipment or phone can store a subscriber access line identity, and the stored identity can be used (text excerpted at this point).
Not established by this excerpt: The full claim set and their exact scope; the complete description; specific prior-art references; and any litigation, ownership-transfer, validity, or novelty conclusions. Priority date and legal status are flagged in the source as assumptions, not legal conclusions.
Source: https://patents.google.com/patent/[US8121613](/patent/US8121613)/en
Generated 10/1/2026, 9:52:52 PM
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Litigation summary
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Proceedings on file (0)
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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.