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:
Oct. 20, 1992
Filed:
Apr. 19, 1991
Applicant:
Inventors:
Hiroaki Araki, Kanagawa, JP;
Kenichi Yoden, Kanagawa, JP;
Assignee:
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
428323 ; 428329 ; 4284259 ; 428694 ; 428900 ; 427128 ; 427131 ;
Abstract
A magnetic recording medium improved in reproduced output over a wide wavelength region, and methods for producing the same are disclosed, the magnetic recording medium having at least two magnetic layers each containing ferromagnetic powders dispersed in binders, which medium comprises a lower magnetic layer containing an acicular ferromagnetic powder having a coercive force of 600 to 2,000 Oe and an upper magnetic layer containing a plate-shaped ferromagnetic alloy powder having a coercive force of 1,000 to 5,000 Oe, a saturation magnetization of 90 to 150 emu/g and an axis easily magnetizable vertically to a plate surface.