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:
Oct. 04, 1983
Filed:
Jul. 30, 1982
Applicant:
Inventor:
Seizo Watanabe, Hachioji, JP;
Assignee:
Olympus Optical Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01F / ;
U.S. Cl.
CPC ...
427130 ; 427132 ; 427172 ;
Abstract
A method of manufacturing a magnetic recording medium of thin metallic film type comprises, a first step of forming a thin magnetic metallic film layer on a base film which heat-contracts both in a first direction and in a second direction perpendicular to first direction, and a second step of heating the base film, while preventing the base film from heat-contracting in the first direction and thus heat-contracting the base film in the second direction, thereby making cracks in the thin magnetic metallic film layer which extend substantially parallel to the first direction of the base film.