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:
Oct. 15, 1991
Filed:
Dec. 22, 1989
Applicant:
Inventors:
Lifun Lin, Hamden, CT (US);
Ned W Polan, Madison, CT (US);
Assignee:
Olin Corporation, Cheshire, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C25D / ; C25D / ;
U.S. Cl.
CPC ...
204 27 ; 204 28 ; 204 351 ;
Abstract
A method of imparting tarnish and corrosion resistance to a copper or copper alloy foil in which the foil is first coated with a thin layer of zinc on at least one side. Thereafter, the foil is treated with an aqueous solution of chromic acid and sulfuric acid. The foil may then be rinsed in a dilute basic solution having a pH greater than 8 and then dried.