Patents by Inventor Karen A. Gruber

Karen A. Gruber 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).

  • Urea processing agent
    Patent number: 6231632
    Abstract: In one embodiment, the present invention relates to a particulate urea composition containing particulate urea; kaolin; and a dispersant, wherein the dispersant is at least one of ammonia based dispersants, sulfonate dispersants, carboxylic acid dispersants and polymeric dispersants. In another embodiment, the present invention relates to a method of making urea, involving the steps of contacting a urea process stream with a slurry comprising a liquid, kaolin, and a dispersant, wherein the dispersant is at least one of ammonia based dispersants, sulfonate dispersants, carboxylic acid dispersants and polymeric dispersants; and recovering urea.
    Type: Grant
    Filed: May 25, 1999
    Date of Patent: May 15, 2001
    Assignee: Engelhard Corporation
    Inventors: Karen A. Gruber, Shireen A. Mamun