Invalidity dossier
US 8271645
Added 9/23/2026, 10:27:50 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 8,271,645 B2
Title: Systems and methods for trace filters by association of client to vserver to services
Patent number / application: US 8,271,645 B2; Application US 12/626,204
Assignee / Inventors: Original assignee Citrix Systems, Inc. Inventors: Roy Rajan, Sudheer Thokala, Saravanakumar Annamalaisami.
Key dates (per the supplied listing): Priority/filing date 2009-11-25; publication of US20110125892A1 on 2011-05-26; patent granted/publication 2012-09-18; adjusted expiration listed as 2030-10-19; status listed as Active.
Purpose: The patent generally relates to tracing network packets, specifically tracing packets via an intermediary device that provides a client connection to a server. In such arrangements, intermediary devices manage client–server connections, and a client's trace parameters may apply only to the client-to-intermediary connection, leaving clients unable to trace packets on the separate backend connections. The disclosed systems and methods let an intermediary device consolidate information about network traffic undertaken to service a client, so it can process a client packet-trace request to capture complete, end-to-end information about connections between clients and servers.
Plain-language scope (from the excerpted disclosure): A packet engine of an intermediary device between clients and servers receives a request to trace packets based on a trace filter. It evaluates the filter's expressions against a packet of a first transport-layer connection, stores that evaluation in association with the connection, identifies a second transport-layer connection linked to the first through which traffic traverses between client and server, and stores trace information for matching traffic on both connections. The request may include an indicator to trace traffic through any linked connections, and may comprise expressions for source/destination IP address, port, virtual server name, service name, connection number, connection state, or combinations thereof. The filter may be evaluated on the client-side connection.
Not established by this excerpt: The full claim set, dependent-claim limitations, the complete written description, and the exact scope of "linked" connections. The excerpt omits much of the specification (shown as "may evaluate the one or more ex…"). Legal status, ownership transfers, and expiration are listed assumptions, not legal conclusions.
Generated 10/1/2026, 9:33:20 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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