Patents by Inventor Keith Spanswick

Keith Spanswick 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).

  • Calibration device and method of using same
    Patent number: 7413345
    Abstract: A calibration apparatus for the calibration of patient dose measurement and control systems of the character used in diagnostic radiology. The calibration apparatus includes a novel ion chamber that is of rigid construction. The ion chamber has a radiation input face that incorporates an optical alignment target or reticule having markings generally corresponding to a range of field sizes and shapes. A series of radio-opaque targets are embedded beneath the surface of the optical target to facilitate alignment using a radiation image.
    Type: Grant
    Filed: April 11, 2007
    Date of Patent: August 19, 2008
    Inventors: Keith Spanswick, Paul Sunde
  • Electron accelerator unit for electron beam therapy
    Patent number: 4638814
    Abstract: An electron accelerator unit comprises a source of an electron beam and means for finally directing at least a portion of the beam to a therapy site. The directing means is mechanically independent of, and electrically isolated from, the source of the electron beam.In the preferred embodiment, means are provided for aligning the source and the directing means using beams of light which are directed towards a target area on the directing means.
    Type: Grant
    Filed: September 11, 1984
    Date of Patent: January 27, 1987
    Assignee: Siemens Medical Laboratories
    Inventor: Keith A. Spanswick