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. 07, 2005
Filed:
Jan. 15, 2003
Applicants:
Joseph Leigh, Campbell, CA (US);
Nobuo Kurataka, Campbell, CA (US);
Inventors:
Joseph Leigh, Campbell, CA (US);
Nobuo Kurataka, Campbell, CA (US);
Assignee:
Seagate Technology LLC, Scotts Valley, CA (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B027/36 ; G11B020/18 ;
U.S. Cl.
CPC ...
Abstract
Defects of a hard disk drive servo pattern stamper are detected by comparing a scattered light beam pattern against the known servo pattern. A magnetic field is applied to stamper and the beam is linearly polarized. Variations in the physical offset of the beam, its scatter, are indicative of physical defects. Variations in the Kerr rotation of scattered beam are indicative of magnetic defects.