Invalidity dossier
US 8412241
Added 9/20/2026, 5:14:13 AM
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Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview: US 8,412,241 B2
Title: System, method, and apparatus for using alternative numbers for routing voice calls and short messages in a communications network
Patent number: US 8,412,241 B2
Application number: US 13/307,112
Inventors: Andrew Silver; Patricia A. Landgren
Original/current assignee: Tango Networks Inc
Priority date: 2007-05-18 (listed as an assumption, not a legal conclusion)
Filing date: 2011-11-30
Publication date: 2013-04-02
Anticipated expiration: 2027-05-18
Legal status: Active (as listed; Google states this is an assumption, not a legal conclusion)
Purpose (plain language): The patent concerns routing voice calls and short messages (SMS) in a communications network using alternative numbers. The title, prior-art keywords (enterprise, destination, user, SMS message, party), and classifications point to enterprise and cellular/messaging environments—including diverting calls between subscribers and private branch exchanges, messaging services, and interconnection between PSTN/ISDN and IP/wireless networks.
Scope indicated by the text: Classifications span wireless communication path modification (H04W40/34), user-to-user messaging and message adaptation for wireless (H04L51/00, H04L51/58), text-based messaging and call diversion in telephone networks (H04M3/42382, H04M3/54, H04M3/546), PSTN/ISDN-to-IP interconnection (H04M7/12xx), and SMS/USSD services (H04W4/14), plus call transfer/hold and emergency services (H04W4/16, H04W4/90). The excerpt reports 26 claims, 16 description mentions of communication, and 13 of signaling, but does not reproduce claim language.
Related filings noted: US 20120108222A1; US 8,634,800 B2; US 8,942,664 B2; US 9,596,353 B2; US 10,820,255 B2; US 11,659,471 B2; US 12,219,460 B2.
Source: https://patents.google.com/patent/US8412241/en
What the excerpt does not establish: The excerpt omits the claims, abstract, detailed description, drawings, and figures. It therefore does not establish the specific claimed routing steps, the meaning of "alternative number" as claimed, embodiments, or the cited prior art. No litigation, ownership-transfer, validity, or prior-art analysis is offered here.
Generated 10/1/2026, 10:03:01 PM
Cases on file (0)
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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
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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.