Patents by Inventor Charles Clifton Roberts

Charles Clifton Roberts 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).

  • Colorimetric vinyl chloride indicator
    Patent number: 3966440
    Abstract: A colorimetric indicator for use in indicating the impending exhaustion of a vinyl organo filtering device. The colorimetric indicator material consists of activated alumina impregnated with between 0.5 to 5.0% by weight potassium permanganate and is positioned immediately behind a window in a canister or cartridge used in filtering vinyl organo materials.
    Type: Grant
    Filed: June 3, 1975
    Date of Patent: June 29, 1976
    Assignee: Catalyst Research Corporation
    Inventor: Charles Clifton Roberts