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:
Jun. 30, 1987
Filed:
May. 30, 1985
Applicant:
Inventors:
Assignee:
TDK Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
428323 ; 427131 ; 427128 ; 428329 ; 428331 ; 428336 ; 428694 ; 428900 ; 428408 ;
Abstract
A magnetic recording medium comprising a non-magnetic substrate, a ferromagnetic thin film formed on the substrate, and a top coating layer containing a fine particulate pigment, formed on the surface of the ferromagnetic thin film, wherein the top coating layer satisfies the condition of 0.3x<y<2x where x is the average particle size of the fine particulate pigment and y is the thickness of the top coating layer, and the average particle size x is less than 200 .ANG..