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. 28, 1992
Filed:
Sep. 18, 1989
Applicant:
Inventors:
Toshiro Takahashi, Hamamatsu-shi, Shizuoka-ken, JP;
Noboru Tsuya, Setagaya-ku, Tokyo, JP;
Tadao Tokushima, Hamamatsu-shi, Shizuoka-ken, JP;
Assignee:
Other;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B32B / ; C25D / ;
U.S. Cl.
CPC ...
428141 ; 205203 ; 205222 ; 428156 ; 428167 ; 428172 ; 428195 ; 428209 ; 4284722 ; 428548 ; 428550 ; 428457 ; 428469 ; 428600 ; 428601 ; 428613 ; 428615 ; 428650 ; 428687 ; 428699 ; 428702 ; 428900 ; 428 64 ; 427250 ; 427261 ; 427304 ; 4274431 ; 2041921 ;
Abstract
A substrate for a magnetic disk, having fine roughness formed on its surface by subjecting aluminum or an aluminum alloy to anodic oxidation, packing pores in the anodized layer thereby formed, with a material different in the physicochemical properties from the anodized layer, and letting a plating material grow selectively by an epitaxial method.