Invalidity dossier
US 5313454
Congestion control for cell networks
Current assignee: Cisco Technology Inc
Added 9/23/2026, 8:15:46 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 — US 5,313,454 A
Title: "Congestion control for cell networks"
Patent number / application: US 5,313,454 A; Application No. US 07/861,761.
Inventors: Lionel A. Bustini, Patrick D. Daley, Charles M. Corbalis.
Assignee of record (per source listing): Original assignee Stratacom Inc.; current assignee listed as Cisco Technology Inc. (The source notes listed assignees "may be inaccurate" and that it has performed no legal analysis.)
Key dates: Filed 1992-04-01; priority date 1992-04-01; published/granted 1994-05-17; anticipated expiration 2012-04-01. Legal status listed as "Expired - Lifetime." PCT filing PCT/US1993/002097 and foreign counterparts (AU, JP, EP) are also noted.
Purpose: The invention addresses "traffic congestion prevention and control within the cell switching network." The excerpt explains that in a cell-switching network each node receives, buffers, and forwards cell traffic, with cells buffered by traffic class according to delay and loss sensitivity, and serviced by priority algorithms.
Plain-language scope (from the excerpt): The background distinguishes short-term congestion — "typically handled by discarding traffic at the queue," preferably by marking cells with their "discard eligibility" — from long-term congestion, controlled by admission policies allocating bandwidth and buffers when a connection is established, refusing the connection if resources are unavailable. It also discusses queuing by traffic class (e.g., low-speed statistical, high-speed deterministic, bursty data, multicast) and managing delay via queue sizing, prioritization, and measures such as time stamps and hop counts. The classification listing places the patent in ATM bandwidth-control, admission-control, backpressure, and bandwidth-allocation categories.
What the excerpt does not establish: It provides only background/definitions, not the claims. It does not set out the actual claimed apparatus or method, the specific congestion-control mechanism(s) claimed, or any detailed embodiments. It also does not establish validity, enforceability, litigation history, or prior-art relationships, and no conclusions on those points are drawn here.
Source: https://patents.google.com/patent/US5313454/en (fetched 2026-09-23).
Generated 10/1/2026, 9:41:29 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
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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.