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:
Nov. 17, 1992
Filed:
Mar. 06, 1990
Applicant:
Inventor:
Chung-Yao Chao, Hamden, CT (US);
Assignee:
Olin Corporation, Cheshire, CT (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C23C / ;
U.S. Cl.
CPC ...
427436 ; 148258 ; 148264 ; 148269 ; 148282 ;
Abstract
A process for imparting tarnish resistance to copper and copper alloy materials, particularly copper foil. The material is first treated with an acidic chromium-containing solution to deposit chromium ions on said foil. Thereafter the material is treated with a basic zinc ion containing solution to deposit zinc ions thereon. Finally, the material is rinsed in distilled water to remove any residual basic solution.