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:
Apr. 27, 1976
Filed:
Feb. 28, 1974
Applicant:
Inventors:
Assignee:
TDK Electronic Company, Tokyo, JA;
Primary Examiner:
Int. Cl.
CPC ...
H01F / ;
U.S. Cl.
CPC ...
428539 ; 428900 ;
Abstract
The magnetic recording medium having a magnetic recording layer containing magnetic iron oxide having a cobalt content of 0.5 - 10 wt.% and a ratio of Fe.sup.2.sup.+ /Fe.sup.3.sup.+ of 0.1 - 0.35; wherein the half-value width of the differential curve of the residual magnetization curve is less than 60% of the half-value width of the differential curve of the residual magnetization curve of non-treated magnetic recording layer.