Invalidity dossier
US 6839751
Re-using information from data transactions for maintaining statistics in network monitoring
Current assignee: PACKET INTELLIGENCE LLC
Added 9/23/2026, 4:12:25 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: US 6,839,751 B1
Title: "Re-using information from data transactions for maintaining statistics in network monitoring"
Patent number / application: US 6,839,751 B1; Application No. US 09/608,126.
Inventors: Russell S. Dietz, Joseph R. Maixner, Andrew A. Koppenhaver.
Assignee information (as listed): Original assignee HI/FN Inc.; current assignee listed as Packet Intelligence LLC, with Apptitude Inc also listed. The source notes listed assignees "may be inaccurate" and that Google has not analyzed or warranted the list.
Key dates: Priority date 1999-06-30; filing date 2000-06-30; publication/grant date 2005-01-04; adjusted expiration 2022-06-28. Legal status listed as "Expired - Lifetime."
Purpose and plain-language scope (from the supplied text): The invention concerns network monitoring and, per the title, re-using information obtained from data transactions to maintain statistics. The excerpt's own keyword and topic data indicate subject matter organized around terms such as "flow," "packet," "entry," "server," and "state," with frequent concepts including monitoring processes, methods, memory, processing, functions, responses, extraction, measurement, testing, insertion and deletion, diagrams, communication, and arrays. In plain terms, the disclosed subject matter relates to monitoring network traffic and maintaining statistics by reusing transaction information, with implementation involving processing, memory, data flow/packet entries, and server state.
Source: https://patents.google.com/patent/US6839751/en
What the excerpt does not establish: The supplied text is an excerpt and omits the abstract, specification, and full claim language. It therefore does not establish the precise claimed scope, the specific mechanisms by which information is re-used, or the exact statistical measures maintained. It also does not establish the content of any prior art, the validity of the patent, the current state of the listed litigation or PTAB proceedings, or whether the ownership/assignment trail described (e.g., HI/FN, Apptitude, Exar, Packet Intelligence) is accurate or currently effective—the source itself cautions that assignee listings are not analyzed or warranted. Dates and legal status are likewise presented by the source as assumptions, not legal conclusions.
Generated 10/1/2026, 9:51:04 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)
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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.