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:
Apr. 05, 1994
Filed:
May. 26, 1992
Applicant:
Inventors:
Szuchain Chen, Orange, CT (US);
Nina Yukov, Orange, CT (US);
Assignee:
Olin Corporation, New Haven, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C25D / ;
U.S. Cl.
CPC ...
148258 ; 148253 ;
Abstract
There is provided a method of treating a copper or copper alloy substrate to provide improved resistance to both oxidation and to chemical attack. The substrate is immersed in an aqueous solution containing both chromium (VI) ion and phosphate ions. The treatment is particularly effective for protecting imaged printed circuit boards during storage, handling and use.