Patents by Inventor John Griser

John Griser 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).

  • Patent number: 6644853
    Abstract: A dental x-ray tube head having a housing with an x-ray tube mounted in it, with improved shielding for preventing stray radiation from emanating outside of the path of the primary x-ray beam. The shielding includes an inner hollow element encasing the x-ray tube and having an aperture through which the primary beam projects, with an open end for connecting wires to the x-ray tube. The shielding further includes an outer hollow element which fits over the inner element in such a way as to cover the open end, with clearance for the wires connected to the tube. Both the inner element and the outer element are comprised of a mixture of polypropylene and barium sulfate. The combination of the inner element and the outer element completely surrounds the x-ray tube with the barium sulfate impregnated material, eliminating the use of lead within the tube head, and thereby providing excellent electrical insulation characteristics besides the x-ray attenuation.
    Type: Grant
    Filed: April 5, 2002
    Date of Patent: November 11, 2003
    Inventors: Arkady Kantor, John Griser