Patents by Inventor Volker P Manheim

Volker P Manheim 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 light emitting diodes
    Patent number: 6850013
    Abstract: An infrared light emitting diode arrangement comprising an infrared light emitting diode which emits positive luminescence when forward biased and emits negative luminescence when reverse biased. The diode is driven by an alternating forward and reverse bias input so that the difference in output power between the positive luminescence and the negative luminescence of the light emitting diode is stabilised with respect to temperature. The infrared light emitting diode arrangement has particular application as a source in gas sensors and reduces or eliminates temperature control requirements for infrared light emitting diode sources.
    Type: Grant
    Filed: July 2, 1999
    Date of Patent: February 1, 2005
    Assignee: QinetiQ Limited
    Inventors: Timothy Ashley, John Graham Crowder, Stanley D. Smith, Volker P Manheim