Patents by Inventor Bernard G. Durham

Bernard G. Durham has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Process for reducing the levels of nitrite contaminants in amine oxide surfactants
    Patent number: 5498373
    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.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: March 12, 1996
    Assignee: The Procter & Gamble Company
    Inventors: Larry E. Miller, Gene P. Hawkins, Bernard G. Durham
  • Process for reducing the levels of nitrite contaminants in amine oxide surfactants
    Patent number: 5466870
    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.
    Type: Grant
    Filed: August 5, 1994
    Date of Patent: November 14, 1995
    Assignee: The Procter & Gamble Company
    Inventors: Larry E. Miller, Gene P. Hawkins, Bernard G. Durham