Patents by Inventor Walter F. Karolkiewicz

Walter F. Karolkiewicz 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).

  • Filtration of coal-derived liquids containing particulate solids
    Patent number: 4315824
    Abstract: A method of filtering a coal-derived liquid comprising; mixing the coal liquid with a filter aid material comprising metallic particles; filtering the thus-obtained mixture; subjecting the resulting filter cake material to partial combustion; and separating the metallic particles from the filter cake for reuse as filter aid.
    Type: Grant
    Filed: June 3, 1980
    Date of Patent: February 16, 1982
    Assignee: Hydrocarbon Research, Inc.
    Inventors: Walter F. Karolkiewicz, Pradip Rao