Patents by Inventor William E. Calder

William E. Calder 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).

  • Spectral color generator
    Patent number: 4142801
    Abstract: A spectral color generator is used in an optical sight for use as a gun sight, surveying instrument, or the like, with means for projecting light from the generator in the form of an illuminated reticle into the line of sight. The illumination from the generator is variable in color and intensity for maximum visibility against a variety of backgrounds, and means are provided for precise alignment, adjustment for elevation and windage and for levelling. In its basic form, the sight has long eye relief but is readily adaptable for use with telescopic attachments. The spectral color generator is also illustrated in an operational monitoring system responsive to sensing devices for monitoring a plurality of parameters including opacity and pressure.
    Type: Grant
    Filed: October 1, 1976
    Date of Patent: March 6, 1979
    Inventors: William E. Calder, William L. Robertson
  • Optical sight with variable illumination
    Patent number: 3994597
    Abstract: An optical sight for use as a gun sight, surveying instrument, or the like, with means for projecting an illuminated reticle into the line of sight. The illumination is variable in color and intensity for maximum visibility against a variety of backgrounds, and means are provided for precise alignment, adjustment for elevation and windage and for levelling. In its basic form the sight has long eye relief, but is readily adaptable for use with telescopic attachments.
    Type: Grant
    Filed: December 26, 1974
    Date of Patent: November 30, 1976
    Inventors: William E. Calder, Alan J. Winkelman, William L. Robertson