Patents by Inventor Michael J. Drapac

Michael J. Drapac 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).

  • Line-doubler delay circuit
    Patent number: 7224244
    Abstract: The length of a transmission line delay circuit is halved by inserting a directional coupler in the signal path ahead of the transmission line and either open circuiting or short circuiting the other end of the transmission line. The signal traveling through the directional coupler and through the transmission line is reflected back at the end of the transmission line, and the reflected signal is carried to the coupled output of the directional coupler. Since the signal travels through the transmission line twice, the delay time is doubled. Therefore, for a given delay requirement, the length of transmission line required is only half of the length required for prior art transmission delay lines.
    Type: Grant
    Filed: September 23, 2004
    Date of Patent: May 29, 2007
    Assignee: Chelton, Inc.
    Inventors: Michael J. Drapac, Nicolas J. Schaub
  • Sliding power supply for RF power amplifier
    Patent number: 4320350
    Abstract: A sliding power supply for a radio frequency power amplifier provides power to the power amplifier that is indirectly controlled by the load impedance voltage standing wave ratio of the amplifier. The overall results being an enhancement or improvement in the efficiency of the RF power amplifier into a varying RF load mismatch.
    Type: Grant
    Filed: November 29, 1979
    Date of Patent: March 16, 1982
    Assignee: Rockwell International Corporation
    Inventor: Michael J. Drapac
  • 4:1 Balun
    Patent number: 4260963
    Abstract: A balun is constructed by rolling a strip of flexible dielectric into a loop which has conductive strips on each face.
    Type: Grant
    Filed: October 18, 1979
    Date of Patent: April 7, 1981
    Assignee: Rockwell International Corporation
    Inventor: Michael J. Drapac
  • Balanced four-way power divider employing 3db, 90.degree. couplers
    Patent number: 3988705
    Abstract: A triple 3db, 90.degree. coupler four-way power divider provides four balanced power outputs by combining therewith a fourth coupler, each of whose two inputs is connected to a different one of the two unbalanced outputs of the divider, with the two outputs of the fourth coupler and the two balanced outputs of the divider providing the four-way divided output power.
    Type: Grant
    Filed: November 20, 1975
    Date of Patent: October 26, 1976
    Assignee: Rockwell International Corporation
    Inventor: Michael J. Drapac