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. 15, 1988
Filed:
Dec. 29, 1987
Applicant:
Inventors:
John L Cordani, Waterbury, CT (US);
Raymond A Letize, West Haven, CT (US);
Assignee:
MacDermid, Incorporated, Waterbury, CT (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09R / ;
U.S. Cl.
CPC ...
252 794 ; 20412975 ;
Abstract
The etching rate of an alkaline ammonium copper etching bath is accelerated by inclusion therein of an etchant accelerating amount of a mixture comprising an ammonium halide, a water-soluble salt containing sulfur, selenium or tellurium in the anion, an organic thio compound containing the group ##STR1## and, optionally, a water-soluble salt of a noble metal (e.g. silver).