Invalidity dossier
US 6609159
Methods, systems, and machine readable programming for interposing front end servers between servers and clients
Current assignee: Hanger Solutions, LLC
Added 9/23/2026, 5:57:52 PM
Active provider: DeepSeek · deepseek-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US6609159B1
Title: Methods, systems, and machine readable programming for interposing front end servers between servers and clients.
Patent number / application: US6609159B1; application US09/201,303, filed 1998-11-30. Priority date: 1998-11-30. Publication (grant) date: 2003-08-19. Status listed: Expired – Lifetime (legal status is an assumption, not a legal conclusion).
Inventors: Semyon Dukach, Uri Guttman, Christopher M. Montgomery. Original assignee: Individual; current assignee listed: FAST ENGINES Inc and Hanger Solutions LLC. (Per instructions, ownership-transfer events are not analyzed here.)
Purpose and plain-language scope (from the supplied text): The invention concerns client-server network computing, specifically interposing "front end servers" between servers and clients. The background explains that server programs are typically pre-written object code bought from third parties and cannot be directly modified by end users. Programs called front end servers or middleware exist to enhance such servers, but they require an administrator to reconfigure server parameters and to support the added system complexity. In the Web context, clients are commonly browsers (Netscape Navigator, Microsoft Internet Explorer); server programs are Web servers (e.g., Apache, Netscape, Microsoft), which may host multiple Web sites per computer, and may also run application server programs such as CGI programs, plus stored data like Web pages and graphic files. One computer can act as both client and server. The text notes that HTTP/1.1 multiplexes requests and responses from a given client over a single client connection; some Web servers support it and many do not, and upgrading them can be costly.
Classification: G06F9/54 (and related G06F9/50, G06F2209/54, G06F2209/5016) and H04L67/00 areas (reverse proxies, proxy services, caching).
Source: https://patents.google.com/patent/[US6609159](/patent/US6609159)/en
What the excerpt does not establish: It does not provide the claims, detailed description, figures, or specific embodiments; it does not establish the precise mechanism for interposing front end servers, the scope of claim coverage, or any dates beyond those listed. Litigation, ownership transfers, validity, and prior art are outside this overview.
Generated 10/1/2026, 9:43:07 PM
Cases on file (2)
Group view →Specific litigation cases in our database that name US patent 6609159. The free-form analysis below may also discuss cases beyond this list.
- Hanger Solutions, LLC v. Squarespace, Inc.filed May 27, 20211:21-cv-00774D. Del.terminated Dec 13, 2022dismissed with prejudice
Defendants: Squarespace, Inc.
- Hanger Solutions, LLC v. Extreme Networks, Inc.filed Jan 14, 20211:21-cv-00040D. Del.terminated Apr 12, 2021dismissed
Defendants: Extreme Networks, Inc.
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.
Current assignee: Hanger Solutions, LLC
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.
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This patent in court (2)
2 tracked lawsuits name US 6609159.