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:
Sep. 21, 1976
Filed:
Aug. 01, 1974
Applicant:
Inventors:
Jacob Block, Rockville, MD (US);
Nelson Samuel Marans, Silver Spring, MD (US);
Assignee:
W. R. Grace & Co., Cambridge, MA (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B01D / ; C23F / ; C23F / ;
U.S. Cl.
CPC ...
203-7 ; 159D / ; 203D / ; 210 58 ; 252 82 ; 252180 ; 252394 ; 2604 / ; 2605 / ;
Abstract
A method for decreasing fouling of metalliferous surfaces of apparatus wherein water is evaporated from an aqueous system containing components which deposit onto the surfaces as hydrophilic foulants. The method comprises adding to the aqueous system a chelant-surfactant having a hydrophobic moiety and a chelating moiety through which the chelant-surfactant chelates with the metalliferous surfaces and provides a hydrophobic barrier to deposition of hydrophilic foulants.