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:
Sep. 12, 1995
Filed:
Mar. 10, 1993
Applicant:
Inventors:
Andrew L Wu, Shrewsbury, MA (US);
Paul J Duval, Lexington, MA (US);
Assignee:
Quantum Corporation, Milpitas, CA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
29603 ; 427116 ; 430324 ; 430326 ;
Abstract
A method of making a thin film magnetic head having multi-layer coils wherein a raised insulative photoresist spiral pattern having undercut sidewalls is formed. Two layers of coils are fabricated simultaneously by evaporating metal onto the upper surface of the spiral pattern and in spaces between the pattern. The cross-section of the bottom coil decreases in width with an increase in height. The coils are insulated from each other with a layer of insulative photoresist.