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. 04, 1993
Filed:
Jul. 25, 1990
Applicant:
Inventors:
Takafumi Yanagita, Hino, JP;
Tsutomu Kenpo, Hino, JP;
Assignee:
Konica Corporation, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B / ; B32B / ; G11B / ;
U.S. Cl.
CPC ...
428141 ; 428323 ; 428329 ; 428336 ; 428900 ; 4286 / ;
Abstract
A magnetic recording medium comprising at least two magnetic layers provided on a non-magnetic support, and a backing layer on the support on the side opposite to said magnetic layers, wherein said backing layer has, on the surface thereof, the protrusions each having a height of the peaks thereof within the range of 0.05 .mu.m to 0.6 .mu.m wherein the amount of the protrusions is within the range of 10,000 to 100,000 cm.sub.2 and an interval of the peaks of not less than 10 .mu.m.