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. 12, 1982
Filed:
Nov. 28, 1980
Katsuyoshi Chiba, Hachioji, JP;
Teruo Tsunoda, Nanpeidaimachi, JP;
Yoshiki Kato, Hinodemachi, JP;
Mitsushi Endo, Hadano, JP;
Fumihiko Sawase, Hakonemachi, JP;
Katuji Itikawa, Numazu, JP;
Masa-aki Imamura, Minami-ashigara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A method of coating a magnetic disk wherein while rotating a disk held horizontal at a rotational frequency of 5-700 r.p.m., a magnetic coating composition is sprayed onto the upper and lower surfaces of the disk substantially simultaneously, to form coatings thereon, and the disk is further rotated at a raised rotational frequency, to adjust the thicknesses of the coatings. Further, in case of the rotation for adjusting the thicknesses of the coatings, a shield plate and a bottom plate are respectively disposed over and under the disk, or alternatively, shield plates are disposed over and under the disk, whereby the thicknesses of the coatings on both the surfaces of the disk are made uniform.