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:
Feb. 25, 1992
Filed:
Feb. 21, 1991
Applicant:
Inventors:
Scott R Harder, Naperville, IL (US);
Cynthia A Soderquist, Bolingbrook, IL (US);
Claudia C Pierce, Lisle, IL (US);
Assignee:
Nalco Chemical Company, Naperville, IL (US);
Attorneys:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
C23F / ; C23F / ;
U.S. Cl.
CPC ...
25218828 ; 252390 ; 252392 ; 252397 ; 422 16 ; 422 17 ;
Abstract
New oxygen scavengers for boiler waters have been discovered, which oxygen scavengers are based upon N,N,N',N'-tetra substituted phenylenediamines. These compounds provide oxygen scavenging capabilities, metal passivating capabilities, volatility such that condensate systems in an operating boilder are protected, and may be formulated with other oxygen scavengers and other common treatment agents used in boiler waters. The preferred tetra substituted phenylenediamines are N,N,N', N'-tetramethyl-1,4-phenylenediamines, or its precursors.