Invalidity dossier
US 8924466
Server handoff in content delivery network
Current assignee: MOUNT SHASTA ACQUISITION LLC
Added 8/26/2026, 12:48:53 AM
Active provider: DeepSeek · deepseek-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US8924466B2
Title: Server handoff in content delivery network
Patent number / application: US8924466B2, application US11/978,656
Assignee of record (per source listing): Original assignee Level 3 Communications LLC; current assignee listed as Mount Shasta Acquisition LLC and Level 3 Communications LLC (the source notes listed assignees "may be inaccurate").
Key dates: Priority date 2002-02-14 (stated as an assumption, not a legal conclusion); application filed 2007-10-30; publication of US20080065724A1 on 2008-03-13; patent granted/publication date 2014-12-30; adjusted expiration 2024-04-03; legal status "Expired - Lifetime."
Purpose (as stated in the excerpt): The invention "relates in general to the field of computer networks," and "aspects of this invention pertain to managed object replication and delivery over a network." A typical CDN operator deploys parent servers hosting objects plus edge servers to deliver objects to clients more cost-effectively. Because storing all objects at every edge server is often infeasible—objects may be very large and demand changes—the excerpt frames a need to serve the most popular objects from edge servers while serving the rest from parent servers, and to populate edge servers, e.g., "storage fill on demand," without making end-users wait.
Plain-language scope: The described subject matter concerns managing how objects are copied to and delivered from servers in a content delivery network, including replication schemes, popularity computation, object purging, and the difficulties of fetching large objects from parent to edge servers (e.g., limited parent-path bandwidth, congestion, and quality loss/"thinning" with streaming protocols such as RTSP/RTP).
Source: https://patents.google.com/patent/[US8924466](/patent/US8924466)/en
What the excerpt does not establish: It supplies only the abstract/definitions portion, figure captions, and bibliographic data—no claims text, no full written description, no prosecution history, and no prior-art analysis. Therefore it does not establish claim scope, claim validity, inventorship details, the actual operation of the "server handoff" of the title, or the accuracy of the listed assignees, priority date, and legal status (each expressly characterized in the source as an assumption).
Generated 10/1/2026, 10:03:58 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
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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.