Invalidity dossier
US 5745066
AD converter and magnetic recording/regenerating apparatus using thereof
Current assignee: HGST Japan Ltd
Added 9/23/2026, 10:37:34 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 — US5745066A
Title: AD converter and magnetic recording/regenerating apparatus using thereof
Source: https://patents.google.com/patent/[US5745066](/patent/US5745066)/en
Bibliographic data (as listed): Application number US08/712,558; filed 1996-09-13; granted/publication date 1998-04-28; priority date 1993-06-07. Original assignee: Hitachi Ltd. Current assignee listed: HGST Japan Ltd. Inventors: Tsuguyoshi Hirooka, Shoichi Miyazawa, Ryutaro Horita, Terumi Takashi, Akira Uragami. Legal status listed as "Expired – Fee Related," with an anticipated expiration entry dated 2014-06-03 and a 2005-01-27 reassignment to Hitachi Global Storage Technologies Japan, Ltd. Classifications include H03M1/00, H03M1/34–1/365 (flash-type analog-to-digital conversion) and various G11B subclasses.
Purpose: The patent addresses an analog-to-digital converter (ADC) intended for a regenerating circuit of a magnetic recording/regenerating apparatus using a constant density recording method, where data must be converted at different frequencies depending on recording position. The stated problem is that higher-speed ADCs require greater power consumption, conflicting with the need for low power consumption. The stated object is an ADC achieving both high-speed AD conversion and low power consumption, including an ADC system with multiple ADCs, and a magnetic recording/regenerating apparatus using such an ADC.
Plain-language scope: Per the excerpted description, the ADC includes comparison means comparing an input analog signal with a reference voltage, where the comparison means' operating speed is determined by an operating current controlled by an instruction from outside the ADC; instruction means for instructing one of multiple conversion speeds; current control means for controlling the operating current according to the instructed speed; and signal generation means for generating a digital signal from the comparison result.
What the excerpt does not establish: It does not provide the full claims, complete description, or drawings; the excerpt notes omitted text. It does not establish the content of the cited Japanese applications (63-200306, 2-182032) beyond the characterization given. It does not, per the source's own disclaimers, constitute legal conclusions on status, priority, or assignee accuracy. No litigation, ownership, validity, or prior-art analysis is offered here.
Generated 10/1/2026, 9:54:09 PM
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Litigation summary
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PTAB challenges
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Assignment history
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Prior art
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Obviousness
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Extensions
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Derivative works
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