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:
Aug. 11, 1992
Filed:
Feb. 01, 1991
Applicant:
Inventors:
Masakuni Takagi, Chiyoda-ku, Tokyo, JP;
Hiroyoshi Takeuchi, Chiyoda-ku, Tokyo, JP;
Hideaki Fukai, Chiyoda-ku, Tokyo, JP;
Toshio Sakiyama, Chiyoda-ku, Tokyo, JP;
Hiroyoshi Suenaga, Chiyoda-ku, Tokyo, JP;
Kuninori Minakawa, Chiyoda-ku, Tokyo, JP;
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B24B / ;
U.S. Cl.
CPC ...
5128 / ; 52132 ; 5228 / ;
Abstract
According to a mirror surface polishing process of the present invention, it is possible to produce Ti-made magnetic disc substrate which have the excellent flatness degree and surface roughness in that the average roughness is not more than 0.05 .mu.m and the flatness degree of the outer periphery is not more than 0.15 .mu.m.