Patents by Inventor Kwaku O. Temeng

Kwaku O. Temeng 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 sulfonylureas
    Patent number: 5550238
    Abstract: This invention relates to a process for preparing sulfonylureas comprising reacting a sulfonyl chloride with a cyanate salt and an amine base in the presence of an inert aprotic solvent to give an isocyanate complex which is then reacted with an amino heterocycle to form the sulfonylurea product and a process for converting the crystal form of the prepared sulfonylurea product to a more stable crystal product form.
    Type: Grant
    Filed: August 23, 1995
    Date of Patent: August 27, 1996
    Assignee: E. I. Du Pont de Nemours and Company
    Inventors: George C. Chiang, Richard F. Davis, Kwaku O. Temeng