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:
Jan. 02, 1979
Filed:
Jan. 18, 1977
Applicant:
Inventors:
Yoshito Mukaida, Odawara, JP;
Masaaki Fujiyama, Odawara, JP;
Shigeo Komine, Odawara, JP;
Masaaki Igarashi, Odawara, JP;
Nobutaka Yamaguchi, Odawara, JP;
Shinobu Iida, Odawara, JP;
Akira Kasuga, Odawara, JP;
Assignee:
Fuji Photo Film Co., Ltd., Minami-ashigara, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01F / ; B32B / ;
U.S. Cl.
CPC ...
428329 ; 252 6254 ; 252 6258 ; 427 48 ; 428408 ; 428900 ;
Abstract
In a magnetic recording substance comprising a non-magnetic support and a magnetic recording layer provided on the support, carbon black having a surface area of at least 700 m.sup.2 /g and an oil absorption of at least 300 ml (DBP)/100 g is contained in the magnetic layer thereby lowering the surface electric resistance without deteriorating the characteristics of the magnetic recording layer.