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:
Jan. 24, 1989
Filed:
Jul. 29, 1987
Applicant:
Inventors:
Druce K Crump, Lake Jackson, TX (US);
Lance A Cooper, Lake Jackson, TX (US);
Thomas M Hopkins, Kilgore, TX (US);
Assignee:
The Dow Chemical Company, Midland, MI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C02F / ;
U.S. Cl.
CPC ...
162 76 ; 162 82 ; 210700 ; 252180 ;
Abstract
Inhibition of calcium scale under the extreme temperature conditions found in pulp digesters has been accomplished by employing certain mixtures of polaminopoly(alkylenephosphonic acids) together with nonionic surfactants. Diethylenetriaminepenta(methylenephosphonic acid) together with a polyethoxynonylphenol has been found especially effective for the purpose.