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:
Mar. 29, 1983
Filed:
Oct. 29, 1981
Applicant:
Inventor:
William R Brasch, Nesconset, NY (US);
Assignee:
LeaRonal, Inc., Freeport, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C23F / ; C23F / ;
U.S. Cl.
CPC ...
1566591 ; 75117 ; 156642 ; 156656 ; 156666 ; 204106 ; 252 794 ; 252147 ;
Abstract
The present invention relates to a method of etching copper with a hydrogen peroxide-sulfuric acid etchant containing an acid soluble phosphonic acid in the manufacture of electronic circuits utilizing a masked copper surface and to a method of recovering the copper from the spent etch solution by electrolysis in solid continuous form saleable as electrolytic copper.