Patents by Inventor David E. Leadley

David E. Leadley 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).

  • Fail safe shutter for use with a cross-stack monitor
    Patent number: 7469717
    Abstract: A fail-safe shutter (13) for a “cross-stack” monitor, comprises a body member (14) having an aperture (1) through which, in use, an associated monitoring instrument is adapted to sight. A gate (3) is movable between a retracted, open position in which the aperture (1) is exposed, and a closed position in which the aperture (1) is closed-off by a portion of the gate (3), and means are provided to bias the gate (3) towards its closed position.
    Type: Grant
    Filed: July 21, 2006
    Date of Patent: December 30, 2008
    Assignee: Land Instruments International Ltd.
    Inventor: David E. Leadley