Invalidity dossier
US 6091708
Added 9/23/2026, 2:14:32 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 6,091,708 B1
"Traffic shaper with multiply queued virtual paths"
Bibliographic data (from supplied text): Inventor Keiji Matsunuma; original and current assignee Oki Electric Industry Co., Ltd.; application US 08/873,710, filed 1997-06-12; priority date 1996-06-28; granted and published 2000-07-18; status listed as "Expired – Fee Related," with anticipated expiration 2017-06-12 (the record notes legal status is an assumption, not a legal conclusion).
Purpose: The patent addresses controlling cell traffic fed into an ATM virtual-path-switching network. Such a network "switches the cell traffic on a virtual-path basis by an asynchronous time-division multiplexing scheme in which the virtual paths do not have fixed time-slot assignments."
Plain-language scope: The disclosed traffic shaper keeps two queues per virtual path — one for a regular class of service, one for a variable class. Incoming cell headers are read by a header converter that determines an outgoing virtual path, an outgoing virtual channel, and an internal class; a cell distributor routes cells to the corresponding queue. A traffic control table stores per-path parameters: peak cell rate (PCR), allowed cell rate (ACR), and a resource-management cell rate.
Reading from the queues follows a priority order — first-queue (regular) cells, then forward resource-management (FRM) cells, then second-queue (variable) cells — subject to three rate limits: FRM flow on each path stays within a fraction of ACR set by the resource-management cell rate; combined FRM plus second-queue flow stays within ACR; total path cell flow stays within PCR. ACR adjusts upward by Nrm·AIR and downward by Nrm·ACR/RDF based on the CI bit in returning backward resource-management cells, per FIG. 8. A third, priority queue limited to a priority cell rate below PCR is optionally provided; a second embodiment uses four logic circuits (RR, RV, RF, RE) to issue the corresponding read signals.
Not established by this excerpt: The full claim set, the complete description and drawings, and the precise definitions, equations, or numerical examples for the parameters mentioned (ICR, AIR, RDF, Nrm). No litigation, ownership-transfer, validity, or prior-art analysis is included or implied.
Generated 10/1/2026, 9:52:26 PM
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Litigation summary
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PTAB challenges
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Assignment history
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Prior art
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Obviousness
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Extensions
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Derivative works
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