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. 09, 1990
Filed:
Apr. 05, 1989
Lifun Lin, Hamden, CT (US);
Ned W Polan, Madison, CT (US);
Olin Corporation, Cheshire, CT (US);
Abstract
A treatment for metal foil, particularly copper or copper alloy foil, to be used in electrical and electronic applications wherein the bond strength of the foil is improved. The treatment includes applying an aqueous solution of chromic acid phosphoric acid to the foil, rinsing the foil in an aqueous solution having a pH of at least 8 and thereafter forming a plurality of copper or copper oxide dendritic structures on at least one side of the foil. The foil may be further treated by applying a coating of zinc or other suitable material over the dentritic structure and an anti-tarnish treatment applied. The anti-tarnish treatment includes applying a thin coating of zinc to the smooth side of the foil followed by treating the foil with a chromic acid sulfuric acid solution to provide a layer of chromate on both surfaces. The foil is then further treated by rinsing with an aqueous solution of a pH of at least 8 and dried.