Invalidity dossier
US 5600354
Wrap-around flex with address and data bus
Current assignee: Hewlett Packard Development Co LP
Added 9/24/2026, 12:50:23 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: US 5,600,354 A
Title: Wrap-around flex with address and data bus
Patent number: US 5,600,354 A
Application number: US 08/228,471
Inventors: David E. Hackleman, William A. Buskirk, Ross R. Allen
Original assignee: Hewlett-Packard Company (current assignee listed as Hewlett-Packard Development Co. LP)
Priority date: 1992-04-02 (claimed from US 07/864,890)
Filing date: 1994-04-14
Publication/grant date: 1997-02-04
Legal status: Expired – Lifetime (anticipated expiration 2014-02-04)
Purpose. The patent relates generally to inkjet printers and, more particularly, to printhead data and control circuitry for wide-array printers. Thermal inkjet print cartridges heat a small volume of ink so it vaporizes and is ejected through orifices to print dots on a recording medium. A printhead generally includes ink channels feeding vaporization chambers near each orifice, a nozzle member with orifices in a required pattern, and a silicon substrate containing thin-film resistors—one per vaporization chamber. Properly sequenced ejection as the printhead moves relative to the medium produces characters or images; the medium is typically shifted after each pass.
Plain-language scope. From the title and definitions, the disclosed subject matter concerns a "wrap-around flex" carrying an address and data bus, aimed at routing printhead data and control signals in wide-array printers. The classification data lists electrical connections for connecting the chip to the outside (B41J2/14072), line-print head arrangements (B41J2/155), and head-unit assembly (B41J2202/19).
What the excerpt does not establish. The supplied text is an excerpt. It does not include the claims, detailed description, drawings, or the specific prior-art references relied upon. It therefore does not establish the precise claimed structure, the exact wiring or bus arrangement, or the distinguishing features over prior art. Dates, assignees, and legal status are as listed by the source and are not independently verified here.
Generated 10/1/2026, 9:31:44 PM
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Litigation summary
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Proceedings on file (0)
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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
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Extensions
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Derivative works
Defensive disclosure: derivative variations of each claim designed to render future incremental improvements obvious or non-novel.