Patents by Inventor Robert C. Pomerhn

Robert C. Pomerhn 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).

  • Water-resistant asbestos-cement
    Patent number: 3985610
    Abstract: An improved low density asbestos-cement product and the process whereby it is produced wherein an asphalt emulsion is combined with the formulation from which the product is made, which asphalt emulsion has an asphalt phase which asphalt has a softening point of at least 150.degree.F and is dispersed in water in globules all smaller than 10 microns.
    Type: Grant
    Filed: January 7, 1974
    Date of Patent: October 12, 1976
    Assignee: National Gypsum Company
    Inventors: Robert C. Pomerhn, Robert M. Johnson