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. 09, 1987
Filed:
Apr. 18, 1986
Applicant:
Inventors:
John P Terry, Memphis, TN (US);
Oscar W May, Memphis, TN (US);
Assignee:
Buckman Laboratories, Inc., Memphis, TN (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C23F / ; C02F / ; C09K / ;
U.S. Cl.
CPC ...
422 15 ; 210697 ; 210700 ; 252181 ; 25238922 ; 252180 ;
Abstract
A method of controlling the corrosion of a metal surface in contact with an aqueous system while at the same time preventing the precipitation of potentially scale-forming calcium phosphate. The water in such systems is treated with a combination of a source of orthophosphate ion and a mixture of methylene phosphonic acid derivatives of C.sub.6 diamines, or the salts thereof. A composition for preventing the precipitation of calcium phosphate containing a mixture of methylene phosphonic acid derivatives of C.sub.6 diamines or the salts thereof.