Patents by Inventor Andrew David Garry Stewart

Andrew David Garry Stewart 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).

  • Detector for ionising radiation
    Patent number: 6707045
    Abstract: A detector for ionising radiation comprises first (10) and second (12) diamond detector elements which are connected to a common contact (14). The two detector elements are of differing thickness and are optimised for the detection of different types of radiation, so that the detector simultaneously provides two output signals indicative of different kinds of radiation incident on the detector.
    Type: Grant
    Filed: July 5, 2001
    Date of Patent: March 16, 2004
    Inventors: Ricardo Simon Sussmann, Geoffrey Alan Scarsbrook, Andrew David Garry Stewart
  • Waveguide window
    Patent number: 6493499
    Abstract: A window for a waveguide for a beam of electromagnetic radiation. The window includes a layer of a material capable of allowing electromagnetic radiation to pass therethrough and a support on each side of the layer. Each support defines a passage for electromagnetic radiation. Further, the layer is provided with at least one recess formed in the periphery thereof.
    Type: Grant
    Filed: December 21, 2000
    Date of Patent: December 10, 2002
    Inventors: John Robert Brandon, Christopher William Ogilvie Thompson, Ricardo Simon Sussmann, Andrew David Garry Stewart
  • Diamond marking
    Patent number: 6391215
    Abstract: An information mark invisible to the naked eye is applied to the polished facet of a diamond gemstone by coating the diamond gemstone surface with an electrically conductive layer so as to prevent the diamond becoming charged, forming the mark with a focused ion beam, and cleaning the diamond surface with a powerful oxidizing agent to reveal a mark having an appropriate depth, which does not detrimentally affect the clarity or color grade of the diamond.
    Type: Grant
    Filed: March 6, 2000
    Date of Patent: May 21, 2002
    Assignee: Gersan Establishment
    Inventors: James Gordon Charters Smith, Andrew David Garry Stewart