Patents by Inventor Sari Frey

Sari Frey 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 preparing N, N-dimethylurea
    Patent number: 3937727
    Abstract: Urea is reacted with at least a onefold molar excess of dimethylamine in a substantially anhydrous system under pressure and temperature conditions adapted to produce unsymmetrical dimethylurea in essentially quantitative yields.
    Type: Grant
    Filed: July 5, 1974
    Date of Patent: February 10, 1976
    Assignee: Ashland Oil, Inc.
    Inventors: Peter E. Throckmorton, Sari Frey, Dace Grote