Patents by Inventor Robert W. Crisman

Robert W. Crisman 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).

  • Fuel sludge treatment method, especially for leaded gasoline storage tank sludge
    Patent number: 4447332
    Abstract: A sludge treatment technique adapted for separating volatile liquid hydrocarbons and/or water from sludge solids in a horizontal enclosed tank having a supported bed of filter particles. Liquids are permitted to drain and evaporate under controlled conditions and a removable top closure permits exposure of sludge solids to ambient U-V radiation and weathering conditions whereby lead-containing sludge is detoxified to environmentally acceptable levels.
    Type: Grant
    Filed: March 25, 1983
    Date of Patent: May 8, 1984
    Assignee: Mobil Oil Corporation
    Inventors: Robert W. Crisman, Dominick DeAngelis