Patents by Inventor David O. Hansen

David O. Hansen 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).

  • Parallel resonant circuit with feedback means for increasing Q
    Patent number: 3965441
    Abstract: In a parallel resonant circuit having an inductor connected in parallel with a capacitor, a sensing resistor is connected in series with the inductor to sense the current in the resonant circuit. The voltage drop across the sensing resistor is applied to an operational amplifier and the amplified output voltage is fed back to the circuit loop out of phase with the sensed voltage drop so as to reduce the effective circuit resistance and thereby increase the circuit Q.
    Type: Grant
    Filed: June 20, 1975
    Date of Patent: June 22, 1976
    Assignee: TRW Inc.
    Inventors: Neal L. Roy, David O. Hansen