Patents by Inventor Christopher B. Schwerdt

Christopher B. Schwerdt 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: 6606066
    Abstract: A single receiving aperture used, for example, in an airborne seeker system collects energy for three discrete energy sensors/receivers including a laser spot tracker, an RF (millimeter wave) transmitter/receiver, and an infrared detector. The RF transmitter/receiver is located at the focus of a primary reflector located on a gimbal assembly. A selectively coated dichroic element is located in the path of the millimeter wave energy which reflects infrared energy from the primary reflector to an optical system which re-images the infrared energy on the infrared detector. The outer edge or rim of the primary reflector is deformed so that the incoming laser energy focuses to a location beyond the RF transmitter/receiver. The laser sensor is positioned adjacent the RF transmitter/receiver at this location in a back-to-back orientation. The laser energy is then detected using a secondary reflector and an optical system which directs the laser energy from the secondary reflector to a laser detector.
    Type: Grant
    Filed: October 29, 2001
    Date of Patent: August 12, 2003
    Assignee: Northrop Grumman Corporation
    Inventors: James M. Fawcett, Christopher B. Schwerdt, Gary D. Baldwin
  • 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
  • Patent number: 4228423
    Abstract: An offset correction apparatus for a successive approximation analog to digital converter which will correct the A/D converter-derived offset voltage as referred to the analog input to within .+-.1mV of a preset reference over a wide temperature range.
    Type: Grant
    Filed: December 30, 1977
    Date of Patent: October 14, 1980
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventor: Christopher B. Schwerdt
  • Patent number: 4000472
    Abstract: An amplitude modulation envelope detector comprised of a basic voltage doubler envelope detector whose linear dynamic range is increased by a forward bias network and for which the offset voltage is stabilized by temperature drift compensation provided by a temperature compensation network. The forward bias network increases the basic envelope detector linear dynamic range by clamping the basic detector to a predetermined bias voltage which takes the detector components out of the non-linear region of operation, and the temperature compensation network, which is comprised of components matched to those found in the basic envelope detector, stabilizes the offset voltage by providing a signal to the inverting input of an operational amplifier to compensate for the operating characteristic variations of the components in the basic envelope detector and the forward bias network.
    Type: Grant
    Filed: December 30, 1975
    Date of Patent: December 28, 1976
    Assignee: Westinghouse Electric Corporation
    Inventors: Franklin M. Eastland, Camille S. Marie, Christopher B. Schwerdt