Invalidity dossier
US 6275470
On-demand overlay routing for computer-based communication networks
Current assignee: MOUNT SHASTA ACQUISITION LLC
Added 9/21/2026, 10:21:22 AM
Active provider: DeepSeek · deepseek-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
US 6,275,470 B1 — Patent Overview
Title: On-demand overlay routing for computer-based communication networks
Patent number / application: US 6,275,470 B1; application US09/336,487
Inventor: Livio Ricciulli
Original assignee: Digital Island Inc. (the supplied text also lists current assignees MOUNT SHASTA ACQUISITION LLC and Sandpiper CDN LLC)
Key dates: Priority and filing date 1999-06-18; publication/grant date 2001-08-14; anticipated expiration 2019-06-18. Legal status: expired – lifetime.
Purpose and plain-language scope. The patent addresses poor performance on heterogeneous networks such as the Internet, where routing protocols tend to favor connection guarantees and hop minimization over performance. The invention provides an on-demand method and system for discovering optimized paths between source and destination points. Responsive to a request to transmit data, it measures the cost of communicating along a default path derived from existing network routing mechanisms, and measures costs along one or more non-default alternative paths passing through a special group of intermediate nodes termed an "overlay network." An optimized path is selected by comparing the default cost against alternative costs. Messages travel along the optimized path by forwarding from the source to a first overlay node and from the last overlay node to the destination, without modifying existing communication protocols, and replies return from destination to source along the optimized path. The transmitted data may include dynamically generated pages, such as responses to cgi-scripted web requests. The mechanism is intended to be transparent to users.
Supplied source URL: https://patents.google.com/patent/US6275470/en
What the excerpt does not establish. The supplied text is an excerpt; claim language, the detailed description, drawing contents, and most prior-art citations are omitted (the excerpt names only the Inktomi Traffic Server and Akamai FreeFlow products). It provides no findings on litigation, ownership validity, or prior-art scope, and none are asserted here.
Generated 10/1/2026, 10:01:44 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.