Invalidity dossier
US 6868080
Added 9/23/2026, 1:40:00 PM
Active provider: DeepSeek · deepseek-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview
Title: Voice over internet protocol call fallback for quality of service degradation
Patent number: US6868080B1
Application number: US09/492,423
Assignee/current assignee: Cisco Technology, Inc. (original assignee: Cisco Technology, Inc.)
Inventors: Ilya Umansky; Neil Joffe; Shamim Sharifuddin Pirzada; Dhaval N. Shah
Dates: Priority and filing date: 2000-01-27. Publication (grant) date: 2005-03-15. Anticipated expiration: 2020-01-27. Legal status listed as "Expired – Lifetime."
Purpose and plain-language scope: Based on the supplied excerpt, the patent concerns placing voice calls over a data network using Internet Protocol (VoIP) and, when the quality of service degrades, "falling back" to an alternative telephone service. The listed classifications and prior-art keywords ("call," "voip," "fallback," "incoming," "over") indicate subject matter covering: services where a data network provides telephone service "in addition or as an alternative, e.g. for backup purposes, to the telephone service provided by the telephone services network"; selection among different networks; alternate routing; congestion detection and recovery by diverting traffic; quality-of-service priority handling of real-time traffic; and dynamic in-call resource reallocation "triggered by the network" in response to changing network conditions. Related applications sharing priority are also listed (US09/568,491 and US09/901,779).
Source: https://patents.google.com/patent/[US6868080](/patent/US6868080)/en (fetched 2026-09-23).
What the excerpt does not establish: The supplied text contains only bibliographic data, classification codes, and metadata—no claims, detailed description, or abstract. It therefore does not establish the specific claimed steps of the fallback method, the particular mechanism used to detect QoS degradation, the fallback service employed, or the precise conditions triggering fallback. It also does not establish the detailed relation between this patent and the two priority-related applications; the legal status is expressly an assumption requiring "a legal analysis," and no representation is made about accuracy of assignee listing or priority dates. No litigation, ownership-transfer, validity, or prior-art findings are presented or implied.
All facts above are drawn solely from the supplied source text; no missing details have been added.
Generated 10/1/2026, 9:52:57 PM
Cases on file (0)
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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.
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.