Patents by Inventor Harry C. Robbins

Harry C. Robbins 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).

  • Method for producing stabilized imidazoline derivatives
    Patent number: 4855440
    Abstract: Disclosed is a method for stabilizing the color of liquid imidazolines which comprises pre-treating a polyamine with an effective amount of a hydride, preferably a borohydride, followed by its reaction with a fatty acid or ester thereof under amide-forming reaction conditions to make an amide intermediate, followed by subjecting said amide intermediate to imidazoline-forming reaction conditions to make said color-stablized imidazoline product.
    Type: Grant
    Filed: February 16, 1988
    Date of Patent: August 8, 1989
    Assignee: Sherex Chemical Company, Inc.
    Inventors: Dale F. Shumway, Harry C. Robbins