Invalidity dossier
US 6553413
Content delivery network using edge-of-network servers for providing content delivery to a set of participating content providers
Current assignee: Massachusetts Institute of Technology
Added 9/21/2026, 10:21:59 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 — US6553413B1
Title: "Content delivery network using edge-of-network servers for providing content delivery to a set of participating content providers."
Patent number / application: US6553413B1; application US09/604,878, filed 2000-06-28.
Inventors: F. Thomson Leighton and Daniel M. Lewin.
Assignee: Massachusetts Institute of Technology (original and current assignee as listed).
Key dates: Priority date 1998-07-14; filing date 2000-06-28; publication/grant date 2003-04-22. Status listed as "Expired – Lifetime," with an adjusted expiration of 2020-04-12. Legal status is expressly an assumption, not a legal conclusion.
Purpose and plain-language scope (per the supplied text): The patent concerns a content delivery network (CDN) that uses servers positioned at the edge of the network to deliver content on behalf of a set of participating content providers. The prior-art keywords supplied are "content," "server," "servers," "given," and "dns," indicating the described approach involves DNS-based selection among servers. The classification listing supports this reading: it includes DNS-based name-to-address mapping (H04L61/4511), server selection for load balancing including based on server workload, network conditions, client/server location, hash applied to IP addresses, and random or heuristic selection (H04L67/1001–H04L67/1029), replicated-server access, caching/browsing optimisation (G06F16/957), and web content organisation (G06F16/958).
Litigation note (per supplied source only): The page lists litigation links, including U.S. Supreme Court cases 12-960 and 12-786, Federal Circuit cases 09-1417, 09-1416, and 09-1380, and Massachusetts District Court cases 1:06-cv-11109 and 1:03-cv-10747. Per instructions, no analysis of these matters is provided.
What the excerpt does not establish: The supplied material is an excerpt — it contains no claims, no written description, no abstract, and no prior-art reference citations. It therefore does not establish claim scope beyond the title and classification hints, does not establish validity, inventorship beyond the two named inventors, ownership history, or the substance or outcome of any listed litigation.
Source: https://patents.google.com/patent/[US6553413](/patent/US6553413)/en
Generated 10/1/2026, 10:01:43 PM
Cases on file (0)
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Litigation summary
Past and pending lawsuits — plaintiffs, defendants, jurisdictions, outcomes, and notable rulings.
Proceedings on file (0)
All PTAB activity →AIA trial proceedings (IPR / PGR / CBM) filed at the USPTO Patent Trial and Appeal Board against this patent. Sourced from the USPTO Open Data Portal and refreshed every six hours; each proceeding number deep-links to the PTAB E2E docket.
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
Earlier patents, publications, and products that may anticipate or render the claims unpatentable.
Obviousness
Combinations of prior art that suggest the claimed invention would have been obvious under 35 U.S.C. § 103.
Extensions
Patent term adjustments, term extensions, continuations, divisionals, family members, and expiration dates.
Derivative works
Defensive disclosure: derivative variations of each claim designed to render future incremental improvements obvious or non-novel.