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:
Jun. 03, 1997
Filed:
May. 10, 1993
Applicant:
Inventors:
Isamu Michihata, Hino, JP;
Hideki Murata, Hino, JP;
Katsuyuki Takeda, Hino, JP;
Nobuyuki Sekiguchi, Hino, JP;
Syozo Kikugawa, Hino, JP;
Assignee:
Konica Corporation, , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G11B / ; B32B / ; B05D / ;
U.S. Cl.
CPC ...
428323 ; 428327 ; 428328 ; 428329 ; 428330 ; 4286 / ; 4286 / ; 4286 / ; 428900 ; 427128 ; 427129 ; 427130 ; 427131 ;
Abstract
A magnetic recording medium and a manufacturing process thereof are disclosed. The medium comprises a magnetic layer containing a binder, chromium oxide having an average particle size within the range of 0.3 to 0.5 .mu.m and a metal magnetic powder, wherein the binder comprises a polyurethane resin having a polar group selected from the group consisting of --SO.sub.3 M, --OSO.sub.3 M, --COOM, --PO (OM), and --OPO(OM).sub.2 wherein M represents a hydrogen atom or an alkali metal.