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:
Jan. 10, 1995
Filed:
Dec. 29, 1993
Applicant:
Inventors:
Joseph A Abys, Warren, NJ (US);
Joseph J Maisano, Jr, Denville, NJ (US);
Heinrich K Straschil, Summit, NJ (US);
Assignee:
AT&T Corp., Murray Hill, NJ (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B44C / ; C23F / ; C09K / ;
U.S. Cl.
CPC ...
156656 ; 156637 ; 156664 ; 252 795 ;
Abstract
A cyanide based aqueous solution for stripping palladium from copper-containing substrate. The solution includes a cyanide radical source compound, Na.sub.2 CO.sub.3, a nitrobenzoic acid, NaOH, thallium compound, an organo mercapto compound, and water. The presence of the organo mercapto compound in thallium containing cyanide bath permits efficient stripping of palladium from copper containing substrates with minimum corrosion damage to the substrate.