Patents by Inventor Garth Decker Hillman

Garth Decker Hillman 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).

  • Pressure actuated light pen
    Patent number: 4109146
    Abstract: A pressure actuated light pen attached to the end of an optical fibre bundle has a retractable tip in which is formed an aperture. No image is focussed onto the ends of the fibres until the tip, with the aperture, is retracted to a predetermined position. At this position, the aperture is effectively focussed onto the ends of the fibres, to give an image of sufficient brightness for detection, and processing, by associated circuitry.
    Type: Grant
    Filed: April 25, 1977
    Date of Patent: August 22, 1978
    Assignee: Northern Telecom Limited
    Inventor: Garth Decker Hillman
  • Pressure actuated light pen
    Patent number: 4107540
    Abstract: A pressure actuated light pen attached to the end of an optical fiber bundle has a retractable shutter mechanism at its forward end. The shutter mechanism comprises a plurality of wedge-shaped sections, resiliently urged in a forward direction to at least substantially close off light admittance, and moveable rearwards along inclined paths to produce an aperture at their forward ends, the light pattern at the aperture focussed on the ends of the fibres.
    Type: Grant
    Filed: April 25, 1977
    Date of Patent: August 15, 1978
    Assignee: Northern Telecom Limited
    Inventor: Garth Decker Hillman