Invalidity dossier
US 7219153
Methods and apparatus for distributing content
Current assignee: Cisco Technology Inc
Added 9/20/2026, 5:17:24 AM
Active provider: DeepSeek · deepseek-v4-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US 7219153 B1
Title: Methods and apparatus for distributing content
Inventor: Mark Stuart Day
Assignee: Cisco Technology, Inc. (original and current assignee per the source)
Application No.: US 10/307,705
Filing / Priority Date: 2002-12-02
Publication (Grant) Date: 2007-05-15
Legal Status (as listed): Expired – Lifetime, adjusted expiration 2025-03-16
Classifications: H04L65/80, H04L65/762, H04L67/55 (data packet communication; media packet handling at the source; push-based network services)
Purpose: The patent addresses combining the notification aspects of a presence system with the content-distribution capabilities of a content delivery network (CDN), so that subscribers are both notified of content availability and can retrieve that content quickly. The text notes that conventional CDNs do not maintain subscriber information or notify users of updated content, forcing users to monitor for changes, while conventional presence systems have limited transmission capacity and are not configured for large content such as audio, video, or streaming media. Peer-to-peer file-sharing systems, in turn, lack coordination among hosts holding copies of a file.
Plain-language scope: A computerized device (e.g., a presence server) receives presence information from a content host indicating availability of content associated with that host. The content host is distinct from the CDN's content servers and from its content delivery manager, which directs placement of content among those servers. The device receives a subscription request from a content subscriber and transmits a notification message containing the presence information plus network information indicating the CDN holding the content. This notification enables the subscriber to acquire the content from the CDN rather than only from the host, with notifications sent for subsequent changes in availability.
Not established by the excerpt: The full claim set, dependent-claim limitations, the exact figures/embodiments, prosecution history, and any specific numerical or protocol details are not provided. The excerpt is partial ("consult the source for omitted text"), so claim scope cannot be fully characterized.
Generated 10/1/2026, 10:02:56 PM
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Litigation summary
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Proceedings on file (0)
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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
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
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Extensions
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Derivative works
Defensive disclosure: derivative variations of each claim designed to render future incremental improvements obvious or non-novel.