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:
Jan. 13, 1987
Filed:
May. 04, 1984
Applicant:
Inventors:
Assignee:
Sumitomo Special Metals Co., Ltd., Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
428156 ; 29603 ; 65 36 ; 427129 ; 428163 ; 428336 ; 4283126 ; 4283173 ; 4283184 ; 428432 ; 428433 ; 428694 ; 428900 ;
Abstract
A grooved magnetic substrate for thin film magnetic heads having grooves filled with glass having substantially no pores therein and an interdiffusion layer between substrate and glass of 5 microns or less. The substrate is produced by hot-filling the groove with glass at a viscosity of 10.sup.6 -10.sup.8 poise and subjecting the substrate to hot isostatic pressure at 10.sup.6 poise or higher to define a definite apex point to define the gap depth.