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:
Jul. 28, 1992
Filed:
Nov. 13, 1989
Applicant:
Inventors:
Takafumi Yanagita, Hino, JP;
Tsutomu Kempo, Hino, JP;
Assignee:
Konica Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
428323 ; 428480 ; 428694 ; 428900 ;
Abstract
The improved magnetic recording medium having a magnetic layer on one side of a base support and a backcoat containing a binder and a carbon black on the other side is characterized in that the backcoat further contains an inorganic powder having a hardness of 3-6 on the Mohs scale, the carbon black having an average particle size of 20-100 m.mu., and the binder containing nitrocellulose having a viscosity of 1/8-1/3 second as measured by the falling-ball method.