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:
Jun. 08, 1999
Filed:
Mar. 26, 1993
Applicant:
Inventors:
Jiangbo Ouyang, Bensalem, PA (US);
Philip D Deck, Ardsley, PA (US);
William L Harpel, Langhorne, PA (US);
Assignee:
BetzDearborn Inc., Trevose, PA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C09K / ; C23G / ;
U.S. Cl.
CPC ...
134-3 ; 134 41 ; 252 791 ; 252 792 ; 252D / ;
Abstract
A method of cleaning metal surfaces by using a composition of citric acid, a hydroxycarboxylic acid salt, a nonionic surfactant and a coupling agent is used for cleaning metal surfaces and methods of using the same.