Patents by Inventor Richard D. Varker

Richard D. Varker 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 making lime-silica insulation from perlite
    Patent number: 4033783
    Abstract: This invention relates to the manufacture of lime-silica bonded structural materials particularly suitable where structural materials having thermal insulation properties are desired. More specifically, the invention relates to new and improved methods of manufacturing lime-silica bonded structural materials having high modulus of rupture and high compressive strength.
    Type: Grant
    Filed: June 23, 1975
    Date of Patent: July 5, 1977
    Assignee: General Refractories Company
    Inventors: Franz J. Brodmann, Richard D. Varker