Invalidity dossier
US 9137255
Added 9/23/2026, 10:00:57 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 9,137,255 B2 — "Verifying Server Identity"
Bibliographic data (from supplied text): U.S. Patent No. 9,137,255 B2; application no. 13/493,544; filed 2012-06-11; granted/publication date 2015-09-15; priority date 2011-06-30; inventor Paul A. Lambert; original assignee Marvell World Trade Ltd. (current assignee listing also includes Marvell International Ltd.). An earlier publication, US 20130007850A1, published 2013-01-03. Status: expired – fee related, adjusted expiration 2033-02-08. Related PCT filing: PCT/US2012/042012 (WO2013003023A1). Classifications include H04L63/126, H04L63/162, and H04W12/069.
Purpose: The patent addresses a security gap in hotspot/WLAN access. When a client authenticates to obtain network resources through an access point, the authenticating server's address is obscured by the communication protocols used by hotspots, so credentials cannot be verified. Malicious entities using forged credentials can imitate or corrupt authentication and redirect users to unsecure or corrupted resources, enabling information to be compromised or stolen. The disclosed techniques verify server identity by comparing information included in a grant (e.g., the server's address, DNS name, or credential) against known address information for the legitimate granting authority, enabling access when verification succeeds and disabling access when it fails.
Plain-language scope: In broad terms, the claims/embodiments described cover: (1) receiving a grant of resource access via a wireless network where the server address is undeterminable, the grant including that address, and verifying the server is the granting authority; (2) receiving realm and authentication-server identification from an enrollment server, sending an authentication request through a proxying access point, and verifying the authentication server's credential; and (3) querying an access point via the protocol's data-link layer (e.g., IEEE 802.11u generic advertisement service frames) and verifying a second server's DNS name against DNS information received.
Not established by this excerpt: the full claim text, complete specification, all figures, prosecution history, or any factual findings on ownership transfers, validity, enforceability, or prior art.
Generated 10/1/2026, 9:33:51 PM
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Litigation summary
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PTAB challenges
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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.