Patents by Inventor Christopher G. Paul

Christopher G. Paul 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).

  • Waste-oil cleaning apparatus
    Patent number: 5851386
    Abstract: A waste-oil cleaning apparatus includes a processing tank for holding waste-oil, and arranged such that non-oil liquids in the waste-oil settle in the base of the tank. A conduit and valve arrangement is provided for withdrawing the settled non-oil liquids from the base of the tank. The apparatus also incorporates an oil cleaning unit including a pump, a mesh filter and a centrifuge. Waste oil in the tank is cleaned by pumping oil out of the tank and passing the oil sequentially through the mesh filter and the centrifuge after the settled non-oil liquids are withdrawn from the base of the tank.
    Type: Grant
    Filed: July 18, 1997
    Date of Patent: December 22, 1998
    Inventor: Christopher G. Paul
  • Waste-oil cleaning method and apparatus
    Patent number: 5676840
    Abstract: A waste-oil cleaning method includes filling a processing tank with waste oil, allowing non-oil liquids in the waste-oil to settle to the base of the tank, then withdrawing the settled non-oil liquids from the base of the tank. After these non-oil liquids are withdrawn, the remaining partially cleaned oil is cleaned by pumping oil out of the tank and passing the oil sequentially through a mesh filter and a centrifuge.
    Type: Grant
    Filed: August 8, 1996
    Date of Patent: October 14, 1997
    Inventor: Christopher G. Paul