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:
Oct. 10, 1989
Filed:
May. 27, 1987
Applicant:
Inventor:
Jeffrey Darken, Woking, GB;
Assignee:
OMI International Corporation, Warren, MI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B05D / ; B05D / ; B05D / ; B05D / ;
U.S. Cl.
CPC ...
427 97 ; 427 96 ; 427306 ; 4274431 ;
Abstract
An aqueous composition is provided for treating a laminate in the manufacture of a printed circuit board, the composition comprising a wetting agent, which has a positively charged quaternary nitrogen atom, and a reducing agent which is compatible with the wetting agent. Preferably the reducing agent is hydroxylamine or one or more of its salts, but oxalic acid or one or more oxalates may, alternatively or as well, be used. The compatibility of the wetting and reducing agents enables the number of process steps to be reduced.