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:
Jun. 26, 1990
Filed:
Aug. 10, 1988
Applicant:
Inventor:
David M Oldham, Tucson, AZ (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
369 13 ; 369 54 ; 369 58 ;
Abstract
In method of operating a magnetic recorder, magnetooptic, for example, the erasure direction for successive recording areas (sectors) are determined by the direction of magnetization of prior recording. When the erasure direction is reversed, the direction of remanent magnetiaztion indicating a 'non-erasure', record or information representing direction is also reversed. A mark is placed in each sector for identifying its erasure direction.