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. 12, 1991
Filed:
Feb. 15, 1990
Applicant:
Inventors:
Beat Keel, Prior Lake, MN (US);
Arthur Calderon, Minnetonka, MN (US);
Simon Liao, Santa Barbara, CA (US);
Assignee:
Seagate Technology, Inc., Scotts Valley, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; B44C / ; C03C / ; C23F / ;
U.S. Cl.
CPC ...
360110 ; 29603 ; 156643 ; 156653 ; 156656 ; 1566591 ; 1566611 ; 156667 ;
Abstract
In a method of manufacturing a thin film magnetic head having aligned top and bottom pole tip pieces, a sacrificial mask protects the upper pole tip while the exposed non-aligned portions of the gap material and lower pole tip are removed. The sacrificial mask is deposited using a self alignment technique.
Keel, Beat. (1991). Self aligned magnetic poles using sacrificial mask (U.S. Patent No. 4992901). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4992901
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile