The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 28, 1996
Filed:
Aug. 24, 1995
Applicant:
Inventor:
Donald M Bartlett, Fort Collins, CO (US);
Assignees:
AT&T Global Information Solutions Company, Dayton, OH (US);
Hyundai Electronics America, Milpitas, CA (US);
Symbios Logic Inc., Fort Collins, CO (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
G05B / ;
U.S. Cl.
CPC ...
318563 ; 318466 ; 360105 ;
Abstract
A CMOS disk drive motor control circuit which has back-EMF blocking circuitry for preventing the back-EMF from being dissipated when power is removed from the disk drive motor. The back-EMF provides an alternate power source for parking the read/write head. The circuit is fabricated as a single CMOS integrated circuit which is coupled between a power supply and the disk drive motor. The circuit also includes disk drive head parking circuitry and voltage regulator circuitry.