Invalidity dossier
US 6907042
Packet processing device
Current assignee: Fujitsu Ltd
Added 9/20/2026, 5:21:18 AM
Active provider: DeepSeek · deepseek-flash
Patent summary
Title, assignee, inventors, filing/issue dates, abstract, and a plain-language overview of the claims.
Patent Overview — US6907042B1
Title: Packet processing device
Patent number: US6907042B1
Application number: US09/552,135
Inventor: Naoki Oguchi
Original/Current Assignee: Fujitsu Ltd
Priority date: 1999-05-18
Filing date: 2000-04-19
Publication (grant) date: 2005-06-14
Anticipated expiration: 2020-04-19
Legal status (as listed): Expired – Fee Related
Purpose: The patent relates to a packet processing device having a layered communication protocol, such as a hierarchically structured TCP/UDP/IP stack. The supplied text explains that such devices are used in routers, layer 3 (L3) switches that perform network-layer packet processing in hardware, and network interface card (NIC) devices in host systems. The stated motivation is that transmission speeds have increased continually, and the packet processing device is required to follow up that speed.
Plain-language scope (from the supplied excerpt): The device concerns passing packets between protocol layers. Routers operate as packet forwarding equipment between networks or subnetworks, generally performing third-layer forwarding in the OSI Seven Layer model; a router relays IP packets in the third layer and can itself act as a communication host by initiating and terminating packets for remote control. L3 switches perform comparable third-layer forwarding but implement the IP relay processing in hardware logic rather than software. NIC devices mainly serve as interfaces of a terminal host at an initiation/termination point, handling protocol processing so applications can send and receive packets; a host with plural NIC devices can also forward packets via communication software. The text also discusses kernel/user memory-space separation, the need for memory copies when passing data from a TCP socket buffer to an application, and the zero-copy TCP method that makes part of the OS kernel memory space accessible to the application. The prior-art keywords listed are packet, receiving, buffer, processing device, and big.
Source: https://patents.google.com/patent/[US6907042](/patent/US6907042)/en
What the excerpt does not establish: It does not provide the claims, detailed description, drawings, or embodiments, so the precise claimed scope is not established here. It does not establish any litigation, ownership transfer, validity, or prior-art conclusions.
Generated 10/1/2026, 10:02:45 PM
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Litigation summary
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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
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Obviousness
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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.