Patents by Inventor Frank G. Back

Frank G. Back 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).

  • Episcopic projector
    Patent number: 4380380
    Abstract: An episcopic projector in which a field flattening lens located beneath the copy plane is used to direct light incident the copy and reflected from the copy through a Fresnel lens of relatively long focal length. An intermediate mirror is used for left right correction and the Fresnel lens is mounted so that it may be focused by simply moving it along the optical axis of the system.
    Type: Grant
    Filed: June 11, 1981
    Date of Patent: April 19, 1983
    Inventor: Frank G. Back
  • Orbiter for pyroelectric focusing devices
    Patent number: 4095257
    Abstract: Infrared light from an object directed into a thermal imaging television camera by a lens is passed through an angularly mounted rotating plate to impart orbital motion to the image received upon the image plane of the camera. A variable speed drive is operatively connected to the plate by an elastomeric belt to rotate the plate with a minimum of mechanical vibration. The operator can adjust the speed of the plate's rotation to improve the clarity of the particular scene being televised.
    Type: Grant
    Filed: September 20, 1976
    Date of Patent: June 13, 1978
    Assignee: Zoomar, Inc.
    Inventor: Frank G. Back
  • Three element varifocal lens systems
    Patent number: 4009928
    Abstract: A three element varifocal lens system in which the front and back lens elements are stationary and the inner lens is shiftable from the telephoto to the wide angle position. The front lens is negative while the inner and back lenses are positive. The lens system has particular utility for infrared imaging systems.
    Type: Grant
    Filed: June 27, 1975
    Date of Patent: March 1, 1977
    Inventor: Frank G. Back