Patents by Inventor Roger Stonebank

Roger Stonebank 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).

  • X-ray tube filament current predicting circuit
    Patent number: 4322797
    Abstract: An X-ray generator circuit includes a feedback regulator which adjusts X-ray tube filament current to regulate anode current. A predictor circuit is connected to calculate an appropriate filament voltage from preset values of anode current and anode voltage; it functions to control the filament current during a period immediately following application of the anode voltage and when the feedback regulator is ineffective.
    Type: Grant
    Filed: October 22, 1979
    Date of Patent: March 30, 1982
    Assignee: U.S. Philips Corporation
    Inventors: Kenneth F. Lickel, Roger Stonebank
  • Circuit for overshoot supression in X-ray generators
    Patent number: 4172269
    Abstract: Transient voltage overshoot is known to occur when primary current in a multi-phase X-ray generator high voltage transformer is switched on. Transient overshoot is supressed by connecting an impedance in series with the primary current switch. A second switch short circuits the series impedance after a time delay whose length is controlled as a direct function of the primary voltage and as an inverse function of the primary current.The secondary switch and time delay circuits may comprise self-powered modules which may be added to the primary circuits of existing X-ray generators without additional sensing or power supply connections.
    Type: Grant
    Filed: December 19, 1977
    Date of Patent: October 23, 1979
    Assignee: North American Philips Corporation
    Inventors: Kenneth F. Lickel, Roger Stonebank