Patents by Inventor Gunther Fricke

Gunther Fricke 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).

  • Process for electrostatic separation of pyrite from crude coal
    Patent number: 3941685
    Abstract: An improved process is disclosed for electrostatic separation of pyrite from powdered crude coal comprising vigorously mixing the powdered crude coal with a selected fatty acid glyceride as a conditioning substance and conducting the electrostatic separation at a relative humidity of 2.5-20% and a temperature between room temperature and 100.degree. C. In a multiple stage process yields of purified coal substantially greater than those of prior art processes can be obtained.
    Type: Grant
    Filed: August 15, 1974
    Date of Patent: March 2, 1976
    Assignee: Kali und Salz Aktiengesellschaft
    Inventors: Arno Singewald, Gunther Fricke