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:
Nov. 17, 1992
Filed:
Aug. 29, 1991
Donald W Janz, Oklahoma City, OK (US);
Seagate Technology, Inc., Scotts Valley, CA (US);
Abstract
A method of writing servo patterns to the surface of a disc of a hard disc drive without magnetizing the transducer head by means of which the patterns are written. The surface is initially magnetized in one direction through the transducer head while the disc is rotating to move the disc surface by the transducer head. Each servo pattern is subsequently written by passing a current through the transducer in the opposite direction for selected time interval. Following writing of each pattern, a current is passed through the transducer head in the direction used to initially magnetize the disc for a time interval equal to the time interval during which the pattern was written.