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:
Nov. 04, 1986
Filed:
Feb. 14, 1985
Applicant:
Inventors:
Kuniichi Yoda, Saku, JP;
Kaoru Kawasaki, Saku, JP;
Assignee:
TDK Corporation, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
428329 ; 252 6254 ; 252 6256 ; 360134 ; 360135 ; 360136 ; 427128 ; 428328 ; 428336 ; 428694 ; 428900 ;
Abstract
A magnetic recording medium comprising a transparent support and a magnetic layer formed on the support, said magnetic layer comprising Co-adsorbed Fe.sub.3 O.sub.4 and Co-adsorbed .gamma.-Fe.sub.2 O.sub.3 in a weight ratio of from 40:60 to 80:20, each of said Co-adsorbed Fe.sub.3 O.sub.4 and Co-adsorbed .gamma.-Fe.sub.2 O.sub.3 having a particle size of at least 25 m.sup.2 /g as a BET value.