Patents by Inventor Hendrik K. Sijgers

Hendrik K. Sijgers 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).

  • Patent number: 5479016
    Abstract: A GEN II FLIR kit having two assemblies mounted on a common platform, the rst comprising a dewar, integral cooler, and imaging optics with scanner folded into a compact unit and the second assembly comprising a set of afocal optics with wide and narrow fields of view.
    Type: Grant
    Filed: August 25, 1994
    Date of Patent: December 26, 1995
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: John J. Curry, Robert C. Guckian, John M. Hall, Hendrik K. Sijgers
  • Patent number: 5214438
    Abstract: The present invention is an integrated millimeter wave (MMW) and an infrared (IR) common aperture sensor employing a common primary reflector for infrared and millimeter wave energy. An active transmitter/receiver millimeter wave horn assembly located at the focus of the primary mirror transmits and receives millimeter wave signals off the primary reflector. A selectively coated dichroic element is located in the path of the millimeter wave energy on the axis between the feed and the primary reflector. The dichroic element reflects infrared energy from the primary reflector to a focal point and at the same time transmits and focuses millimeter wave energy. An optical system relays the infrared energy to a focal plane behind the primary mirror. The dichroic element transmits and focuses millimeter wave energy without significant attenuation such that optical and millimeter wave energy may be employed on a common boresight.
    Type: Grant
    Filed: August 9, 1991
    Date of Patent: May 25, 1993
    Assignee: Westinghouse Electric Corp.
    Inventors: Thomas C. Brusgard, Thomas C. McCormick, Hendrik K. Sijgers, Corbitt T. Smith, William C. Winterble, Christopher B. Schwerdt