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. 28, 1989
Filed:
Mar. 02, 1987
Applicant:
Inventors:
Wilhelm Ohlinger, Jan Jose, CA (US);
Nicholas M Warner, Livermore, CA (US);
Assignee:
Unisys Corp., Detroit, MI (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G05B / ; G11B / ;
U.S. Cl.
CPC ...
318603 ; 318600 ; 318618 ; 360 / ; 360 7807 ;
Abstract
Disclosed is a servo control system for a disk drive actuator using a bi-directional (Up/Down) Difference Counter along with a control circuit therefor which signals the counter each time a 'rest position' is passed, indicating whether this passage is toward, or away-from, the destination track.