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. 07, 1986
Filed:
Sep. 11, 1984
Ikuo Ishiguro, Samukawa, JP;
Hiroyuki Nagao, Hiratsuka, JP;
Pilot Man-Nen-Hitsu Kabushiki Kaisha, Tokyo, JP;
Abstract
Aluminum or an aluminum alloy on the surface of which an anodic oxide film comprising a porous layer and a barrier layer having micropores in the porous layer has been formed by a primary anodic oxidation treatment is subjected to a secondary anodic oxidation treatment and an immersion treatment so as to enlarge the pore diameter of the micropores, to make the cross-sectional profile of the micropores circular, and to make the thickness of the barrier layer and thus, the length of the micropores uniform, and subjecting the so treated aluminum or aluminum alloy to an electrolytic deposition treatment in an electrolytic bath containing a magnetic substance so as to uniformly allow a large amount of the magnetic substance to be deposited in the enlarged, uniform micropores, thereby obtaining a magnetic recording material having improved magnetic intensity and magnetic characteristics.