Patents by Inventor A. Stevens Halsted

A. Stevens Halsted 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).

  • Infrared scanning and display system having a noncontacting angle encoder
    Patent number: 4152588
    Abstract: A scanning mirror position sensor operable from the back side of a scanning mirror which utilizes the front side of the mirror for scanning a scene to be interrogated or displayed. A rectangular uniformly distributed light source is reflected from the back surface of the scanning mirror across a grating consisting of alternate transparent and opaque regions placed in the focal plane in front of a single large area photodetector. As the light from the light source sweeps across the grating, the detector is alternately energized and deenergized to form a serial pulse train which is coupled to a pulse counter which accumulates the pulse count to thereby provide a continual and accurate measure of the mirror position.
    Type: Grant
    Filed: October 28, 1977
    Date of Patent: May 1, 1979
    Assignee: Hughes Aircraft Company
    Inventors: Robert W. Klatt, A. Stevens Halsted