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. 27, 1990
Filed:
Feb. 23, 1990
Applicant:
Inventors:
Michael J Pryor, Woodbridge, CT (US);
Andrew J Brock, Cheshire, CT (US);
Assignee:
Olin Corporation, New Haven, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C23F / ;
U.S. Cl.
CPC ...
156642 ; 156666 ; 204104 ; 204106 ; 204130 ; 204260 ; 204262 ; 252 792 ; 252 793 ;
Abstract
A process for etching copper or a copper base material with an aqueous solution consisting essentially of peroxydisulfuric acid, up to about 500 ppm of a halide addition and the balance water is described. The process includes off-line generation/regeneration of the etching solution. An electrochemical cell for generating/regenerating the etching solution is also described.