Invalidity dossier
US 6154843
Secure remote access computing system
Current assignee: Microsoft Technology Licensing LLC
Added 9/23/2026, 7:52:46 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: US6154843A — "Secure Remote Access Computing System"
Bibliographic data (per supplied text): US Patent 6,154,843; application US08/822,303; filed 1997-03-21; granted/published 2000-11-28; priority date 1997-03-21; anticipated expiration 2017-03-21; status listed as "Expired – Lifetime." Inventors: Edward C. Hart, Jr.; Casey Lang Kiernan; Vij Rajarajan. Original assignee: [Microsoft Corp.](/litigations/by-plaintiff/Microsoft%20Corp.); current assignee listed as Microsoft Technology Licensing, LLC. Classifications include G06F21/00, G06F21/60, G06F21/606, H04L63/00, H04L63/10, H04L67/01, and H04L67/133 (RPC).
Purpose: The invention addresses secure remote access to computing resources. The text describes alternatives that require a user's physical presence, private communication media (hard-wired or MODEM dial-up), or encrypted/password-protected dial-up over public media, each with stated drawbacks. The stated object is to let an unsecured remote computing device define and execute a task on a device within a private network via a secure network interface device acting as the private network's gateway.
Plain-language scope: A remote user's device (e.g., a personal computer with modem access) connects over a public network (the Internet/World Wide Web is named) to the secure network interface device using standard protocols, with password-protected access. The user identifies a task; the interface device verifies the user has permission to execute it. The interface device then dynamically generates a customized program—described as customized Web pages and program code—giving the user an interface to define task parameters while disclosing only limited information about the target device or private network. Parameters return to the interface device, which executes the task on the private network via a secure link. The user is never logged into another device and never directly contacts the target device or private network; the interface device alone executes tasks on the user's behalf.
Not established by this excerpt: The full specification, all claims (scope of claim coverage is not shown), drawing contents beyond FIG. 1 and FIG. 2 references, any prosecution history, or the accuracy of the listed legal status and assignees. No prior art or validity assessment is provided here.
Source: https://patents.google.com/patent/[US6154843](/patent/US6154843)/en
Generated 10/1/2026, 9:41:44 PM
Cases on file (0)
Specific litigation cases in our database that name US patent 6154843. The free-form analysis below may also discuss cases beyond this list.
No cases on file mention this patent. Upload a CSV or add a case manually in Admin → Manage litigation cases.
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.