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. 16, 1979
Filed:
Feb. 24, 1977
Applicant:
Inventors:
Assignee:
Fuji Photo Film Co., Ltd., Minami-ashigara, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B / ;
U.S. Cl.
CPC ...
428323 ; 427128 ; 427129 ; 427130 ; 427131 ; 427132 ; 428173 ; 428331 ; 428409 ; 428446 ; 428539 ; 428900 ; 360134 ;
Abstract
In a magnetic recording substance comprising a magnetic recording layer on one side of a non-magnetic support and a back layer on the other side thereof, the back layer is provided by coating a powdered solid with a binder and coating solvent and having spike grains with a height of 0.8 to 5 microns and an interval or pitch of at least 200 microns on the surface thereof and a friction coefficient of at least 0.25.