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. 06, 1992
Filed:
Aug. 22, 1990
Applicant:
Inventors:
Assignee:
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
428215 ; 428323 ; 428329 ; 428336 ; 428402 ; 4284246 ; 4284259 ; 428515 ; 428518 ; 428520 ; 428522 ; 428694 ; 428695 ; 428900 ;
Abstract
A magnetic recording medium excellent in video output and audio output is disclosed which comprises a non-magnetic support having thereon at least plurality of a first magnetic layer and a second magnetic layer, containing ferromagnetic particles dispersed in a binder, in that sequence, wherein said first magnetic layer contains an amine-modified vinyl chloride copolymer as the binder. Preferably, the second magnetic layer contains a vinyl chloride copolymer as a binder having at least one polar group selected from the group consisting of --OH, an epoxy group, --COOM, --SO.sub.3 M, --OSO.sub.3 M, ##STR1## wherein M represents hydrogen, an alkali metal or ammonium.