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:
Apr. 30, 1996
Filed:
May. 15, 1995
Katsumi Ryoke, Kanagawa, JP;
Katsuhiko Meguro, Kanagawa, JP;
Hiroaki Doushita, Kanagawa, JP;
Masaki Suzuki, Kanagawa, JP;
Toshiyuki Kitahara, Kanagawa, JP;
Masami Sato, Kanagawa, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A magnetic recording medium comprises a magnetic layer containing a ferromagnetic powder, a binder and an abrasive material having a Mohs hardness of 8 or more on a non-magnetic support, wherein the average protrusion height, which represents the length between the central line of the surface roughness of the sectional curve of the magnetic layer and the upper end of the abrasive material existing (i) above the central line of the surface roughness of the magnetic layer and (ii) in the surface layer of the magnetic layer, is 15 nm or less. A process for preparing the magnetic recording medium comprises coating on a non-magnetic support a magnetic layer containing a ferromagnetic powder, a binder and an abrasive material having a Mohs hardness of 8 or more, and then polishing the surface of the magnetic layer with an abrasive tape, wherein as the abrasive tape there is used one containing at least one abrasive material having a higher Mohs hardness than the abrasive material to be incorporated in the magnetic layer.