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:
Mar. 28, 1995
Filed:
Mar. 07, 1994
Applicant:
Inventor:
Kunio Katsuma, Chiba, JP;
Assignee:
Usui Kokusai Sangyo Kabushiki Kaisha, Ltd., Shizuoka, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C25D / ;
U.S. Cl.
CPC ...
205171 ; 205333 ;
Abstract
A method is provided for forming a tough, electrical insulating layer on a surface of a copper material. The copper material is made of copper of a copper-based alloy at least in the surface thereof. According to the method, the copper material is anodized first in an alkaline electrolyte bath of a caustic alkali to form a thin film layer of cupric oxide on the surface of the copper material, and next in an acidic electrolytic bath of a hexacyanoiron complex.