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. 24, 1989
Filed:
Jul. 27, 1988
Applicant:
Inventors:
Kurt E Heikkila, Circle Pines, MN (US);
Rodney K Williams, Stacy, MN (US);
Bruce A Bohnen, Roseville, MN (US);
Assignee:
E. I. Du Pont De Nemours and Company, Wilmington, DE (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C09G / ; C23G / ;
U.S. Cl.
CPC ...
156664 ; 252 792 ; 252 794 ; 25218629 ; 156901 ; 156666 ;
Abstract
The invention is directed to a hydrogen peroxide solution stabilized by a substituted aminobenzaldehyde compound which is soluble in hydrogen peroxide. The stabilized hydrogen peroxide solution contains a mineral acid which is especially useful for etching a surface of a substrate such as a printed wiring board.