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:
May. 15, 1990
Filed:
Sep. 28, 1988
Applicant:
Inventors:
Noboru Tsuya, Setagaya-ku, Tokyo, JP;
Tadao Tokushima, Hamamatsu-shi, Shizuoka-ken, JP;
Toshiro Takahashi, Hamamatsu-shi, Shizuoka-ken, JP;
Assignee:
Other;
Primary Examiner:
Int. Cl.
CPC ...
G11B / ;
U.S. Cl.
CPC ...
4284722 ; 428694 ;
Abstract
A substrate for a magnetic disk, having an anodized aluminum coating layer with pores widened by chemical dissolution so that the total area of pores is from 20 to 80% of the entire surface area.