Patents by Inventor Frederic Dutilleul

Frederic Dutilleul 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).

  • Variable trap circuit
    Patent number: 5841329
    Abstract: In a trap circuit of the bridged-T type, having a delta RC circuit (RR, C1, C2) and a parallel resonant circuit (L, Cp), the capacitance Cp is constituted by variable capacitance diodes (D1, D2) connected via a resistor (8) to a control voltage (Vtone), and the resistor (RR) of the bridged-T circuit is constituted by a PIN diode whose current is controlled by the same control voltage (Vtone) via a resistor (9).
    Type: Grant
    Filed: April 1, 1996
    Date of Patent: November 24, 1998
    Assignee: U.S. Philips Corporation
    Inventor: Frederic Dutilleul