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. 19, 1993
Filed:
Oct. 24, 1990
Katsuyoshi Chiba, Hachioji, JP;
Masayuki Katsumoto, Kodaira, JP;
Yasutaro Uesaka, Kokubunji, JP;
Hajime Fukke, Tama, JP;
Heigo Ishihara, Tokyo, JP;
Iwao Matsuyama, Sagamihara, JP;
Naoki Kodama, Tachikawa, JP;
Hitoshi Inoue, Kokubunji, JP;
Yoshiharu Terada, Kokubunji, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A coating type, magnetic disk is produced by applying a magnetic paint containing magnetic powders in a dispersed state to a non-magnetic substrate, thereby forming a magnetic recording film thereon, and applying surface waves to the magnetic recording film in an undried state. By applying the surface waves to the magnetic recording film, dispersibility and orientation of the magnetic powders are improved and a longitudinally oriented, coating type magnetic disk with distinguished electromagnetic properties, such as a high S/N ratio, etc. can be obtained.