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:
May. 16, 1989
Filed:
Mar. 16, 1988
Applicant:
Inventor:
Toshio Aizawa, Miyagi, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B / ;
U.S. Cl.
CPC ...
156163 ; 156229 ; 156494 ; 264292 ; 425383 ; 425D / ;
Abstract
Method and apparatus for manufacturing a stretched surface recording disk wherein a laminate is formed by superposing magnetic sheets on upper and lower surfaces of a base with a bonding agent being interposed between the regions to be bonded, clamping both an outer annular portion and an inner annular portion of the resulting laminate, displacing the clamped inner annular portion including both magnetic sheets and the base relative to the clamped outer annular portion in a direction perpendicular to the surface of the base, thereby stretching the laminate and bonding the magnetic sheets to the base while the annular portions are so displaced.