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:
Jul. 23, 1991
Filed:
Sep. 25, 1990
Applicant:
Inventors:
Joseph E O'Tousa, Northridge, CA (US);
Clark S Thomas, Woodland Hills, CA (US);
Robert E Foster, Ben Lomond, CA (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
B44C / ; C23F / ; C09K / ;
U.S. Cl.
CPC ...
156664 ; 156656 ; 252 792 ; 252 794 ;
Abstract
The present invention is directed to a chemical etching composition for etching metals or metallic alloys. The composition includes a solution of hydrochloric acid, phosphoric acid, ethylene glycol and an oxidizing agent. The etching composition is particularly useful for etching metal surfaces in preparation for subsequent fluorescent penetrant inspection.