Invalidity dossier
US 5692124
Added 9/21/2026, 10:47:16 AM
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Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview: US5692124A
Title: "Support of limited write downs through trustworthy predictions in multilevel security of computer network communications"
Patent number: US5692124A (application US08/704,896)
Inventors: James M. Holden, Stephen E. Levin, Edwin H. Wrench, Jr.
Assignee history (per supplied text): Originally assigned to ITT Industries, Inc.; later reassigned to Micron Technology, Inc. Current assignee listed as Micron Technology Inc.
Key dates: Priority/filing date 1996-08-30; publication/grant 1997-11-25; anticipated expiration 2016-08-30. Status: Expired – Lifetime.
Purpose and plain-language scope:
The invention relates generally to secure and multi-level secure (MLS) networks, and specifically to a system and method for providing limited write downs of data from higher to lower security classification levels across a computer network.
The patent describes MLS networks that transmit data of different classification levels (Unclassified, Confidential, Secret, Top Secret) over the same physical network, requiring security functions such as data integrity protection, separation of data types, access control, authentication, user identification, and accountability. The stated aim is to perform "limited write downs of data from a higher security classification level to a lower security classification level, across a computer network" so as to "maintain the security of classified data residing at the higher level from covert transference in network protocol fee[.]" (Text truncated in the supplied excerpt.)
Classification codes include H04L63/105 ("Multiple levels of security") and G06F2221/2113 ("Multi-level security, e.g. mandatory access control").
Source: https://patents.google.com/patent/[US5692124](/patent/US5692124)/en
What the excerpt does not establish:
The supplied text is a partial front-matter and definitions excerpt. It does not include the complete claims, detailed description, drawing descriptions, or the full "Background of the Invention" discussion. Therefore, the precise claimed scope, specific embodiment details, and any listed prior-art references cannot be verified from this excerpt. Legal-status information is explicitly noted in the source as an assumption, not a legal conclusion. No litigation, ownership-dispute, validity, or prior-art analysis is offered here.
Generated 10/1/2026, 10:01:04 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.