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:
Oct. 04, 1994
Filed:
Feb. 22, 1993
Applicant:
Inventor:
Richard L Fuller, Anaheim, CA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C02F / ;
U.S. Cl.
CPC ...
210699 ; 134-3 ; 134 2214 ; 134 2219 ; 134 41 ; 210631 ; 210700 ; 210701 ; 252 82 ; 252180 ; 252181 ;
Abstract
Scale is removed, and its formation is reduced or prevented in the effluent section of a sewage treatment plant, by adding a solution containing a small amount of phosphonate and a terpolymer of acrylic acid. The treatment is especially effective in anaerobic areas of the plant, which includes transfer lines from sludge handling systems, pumps, piping, valves, overflow lines, and possibly centrifuges, etc., and particularly where the Ca+ 2 exceeds about 600 ppm, and the system alkalinity varies from about pH 6-9.