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. 28, 1982
Filed:
Dec. 04, 1980
Applicant:
Inventor:
Alan Marshall, Macclesfield, GB;
Assignee:
Ciba-Geigy Corporation, Ardsley, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C23F / ; C23F / ;
U.S. Cl.
CPC ...
422 15 ; 106 1412 ; 106 1413 ; 252181 ; 2523 / ; 422 17 ; 422 18 ;
Abstract
A method of inhibiting the deposition of calcium phosphate scale from an aqueous system treated with a corrosion inhibitor formulation containing a phosphono-carboxylic acid and a polyphosphate comprises adding to the aqueous system a minor amount of hydrolyzed polymaleic anhydride having a molecular weight in the range of from 300 to 5000 as determined by calculation following osmometric measurement on the polymaleic anhydride before hydrolysis, or a water-soluble salt or a hydrolyzed copolymer of polymaleic anhydride.