Patents by Inventor Charles S. Kerfoot

Charles S. Kerfoot 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: 3955169
    Abstract: A thick film spiral shaped resistor deposited on an alumina substrate and bonded to a Kovar plate, an aluminum heat sink is coated on one side with a silicon grease and the Kovar plate is bolted thereto.
    Type: Grant
    Filed: November 8, 1974
    Date of Patent: May 4, 1976
    Assignee: The United States of America as represented by the Secretary of the Air Force
    Inventors: Charles S. Kerfoot, Frank A. Halgas, Louis A. Razzetti, Gene A. Di Gennaro
  • Patent number: H275
    Abstract: A low level input pulse signal from T.sup.2 L logic is delivered to the it of a ground deck driver which is transformer-coupled to a floating deck driver. The leading edge of the input pulse serves to enable or trigger a first FET driver, which is coupled to the gates of a plurality of series-connected FETs via a first transmission line transformer. The triggering of the FET driver serves to turn-on the series-connected FETs so that the same delivers a high voltage signal to an output load. A second FET driver is coupled to the gates of another plurality of series-connected FETs, which serve as a "tail-biter" to terminate the power to the output load. And, a third FET driver is coupled to the gates of the first-mentioned series-connected FETs to turn the same to the OFF state. The second and third FET drivers are coupled to their respective series-connected FETs via respective transmission line transformers.
    Type: Grant
    Filed: June 13, 1986
    Date of Patent: May 5, 1987
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Walter E. Milberger, Franklin B. Jones, Charles S. Kerfoot