Invalidity dossier
US 6282575
Added 9/23/2026, 7:21:30 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 6282575 B1
Title: Routing mechanism for networks with separate upstream and downstream traffic
Patent number / application: US 6282575 B1; Application US08/999,679
Assignee: Intel Corp (original assignee); assignment recorded 1998-05-22 to Intel Corporation. Inventors: Chihuan Michael Lin and John R. Mitkowski.
Key dates: Priority/filing date 1997-12-11; granted and published 2001-08-28; anticipated expiration 2017-12-11. Legal status listed as "Expired – Lifetime."
Purpose: The patent addresses networks in which upstream and downstream traffic travel over different transmission mediums — specifically, one-way cable systems. Downstream data (headend server to client) arrives via a "one-way" cable modem, while upstream data (client to headend server) is sent over the public telephone network through a PSTN modem or ISDN device to a POTS server. In prior approaches, each new client had to be added manually to a network router's routing tables using fixed IP addresses, burdening administrators and wasting IP addresses. The invention aims to automatically set up network traffic routing in such networks while permitting dynamic allocation of IP addresses, so that only one IP address is needed per client and addresses can be conserved.
Plain-language scope: Per the supplied text, the system includes a network access server, an authentication server coupled to it, and a routing manager coupled to both, each with respective port addresses. The routing manager is configured to: (1) receive, on its port address, a set of accounting request packets from the network access server port address; (2) parse the accounting request packet to derive a command flag; (3) forward the accounting request packets to the authentication server port address; and (4) generate a set of routing table modification commands for a network router based on the command flag. The corresponding method recites these steps for automatically setting up a session over separate upstream and downstream channels.
Source: https://patents.google.com/patent/US6282575/en
What the excerpt does not establish: It does not provide the full claims, complete specification, or drawings detail; does not establish validity, enforceability, or the scope of any specific claim; and does not identify prior art or litigation. Some text appears garbled (e.g., "Engineemrs"), so exact wording should be confirmed against the source.
Generated 10/1/2026, 9:42:08 PM
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Litigation summary
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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
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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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