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:
Mar. 12, 1996
Filed:
Jun. 07, 1995
Applicant:
Inventors:
Larry E Miller, Cincinnati, OH (US);
Gene P Hawkins, Oregonia, OH (US);
Bernard G Durham, Mason, OH (US);
Assignee:
The Procter & Gamble Company, Cincinnati, OH (US);
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ; C11D / ;
U.S. Cl.
CPC ...
252546 ; 252541 ; 252544 ; 252545 ; 252547 ; 564-2 ; 564297 ; 564298 ;
Abstract
Amine oxide surfactants contaminated with nitrite are treated under acidic conditions with materials such as maleic acid and diethylenetriaminepentaacetate (DTPA) to reduce nitrite levels below 1 ppm. Thus, C.sub.12-13 dimethyl amine is oxidized with hydrogen peroxide in the presence of maleic acid and DTPA to reduce nitrite levels. The resulting nitrite-free amine oxide is employed in various detergent compositions.