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:
Feb. 18, 1997
Filed:
Aug. 08, 1995
Applicant:
Inventors:
Makoto Hirama, Ibaraki-ken, JP;
Shigeru Ishikawa, Yokohama, JP;
Assignee:
Victor Company of Japan, Ltd., Yokohama, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
428323 ; 428328 ; 428329 ; 428332 ; 4286 / ; 428900 ;
Abstract
The present invention provides a magnetic recording medium having excellent durability, high abrasive resistance and smoothness capable of suppressing development of uneven wear on a tape contact surface of a magnetic head at minimum. The magnetic recording medium has a base film and a magnetic layer provided on the base film. The magnetic layer includes metal magnetic powder of particles having an average long axis length of not more than 0.13 .mu.m, alumina powder of particles which have an average diameter of not more than 0.13 .mu.m, an .alpha.-rate of not more than 30% and pH of not more than 7.0, and a binder resin.