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:
Feb. 04, 1997
Filed:
Nov. 22, 1994
Donald M Bartlett, Fort Collins, CO (US);
AT&T Global Information Solutions Company, Dayton, OH (US);
Hyundai Electronics America, San Jose, CA (US);
Symbios Logic Inc., Fort Collins, CO (US);
Abstract
A CMOS disk drive motor control circuit which has back-EMF regulator circuitry which prevents the back-EMF from the disk drive motor from exceeding a predetermined level. The back-EMF provides an alternate power source for parking the read/write head when power is removed from the disk drive. The circuit is fabricated as a single CMOS integrated circuit which is coupled between a power supply and the disk drive motor. The disk drive control circuit also includes a blocking diode through which power from the power supply flows to the motor and which prevents dissipation of a back-EMF from the motor when power is removed from the motor, and disk drive head parking circuitry which uses the back-EMF to retract and park the disk drive head.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile