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. 21, 1989
Filed:
Oct. 20, 1987
Applicant:
Inventors:
Shinji Saito, Kanagawa, JP;
Hiroaki Araki, Kanagawa, JP;
Kiyomi Ejiri, Kanagawa, JP;
Hiroshi Ogawa, Kanagawa, JP;
Chiaki Mizuno, Kanagawa, JP;
Assignee:
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
428323 ; 427128 ; 428694 ; 428900 ;
Abstract
An improvement of a magnetic recording medium comprising a nonmagnetic support and a magnetic recording layer provided on the support which comprises a binder and a ferromagnetic powder dispersed therein is disclosed. The binder contains a resin component having a metal sulfonate group and the ferromagnetic powder contains water in an amount corresponding to moles of 20-80 times as much as the number of moles of the metal sulfonate group contained in the binder.