Patents by Inventor Donald P. Havens

Donald P. Havens 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).

  • Mechanical filter apparatus having interchanged resonator means for improved coupling of bridging wires
    Patent number: 4573028
    Abstract: By exchanging the position of the input and output resonator means relative to other resonator elements in a mechanical filter, the lengths of the bridging wires used to control the steepness of the bandpass characteristic of the filter can be reduced. Reducing the length of the bridging wires reduces both flexural spurious mode problems and extensional coupling variation problems.
    Type: Grant
    Filed: November 7, 1983
    Date of Patent: February 25, 1986
    Assignee: Rockwell International Corporation
    Inventor: Donald P. Havens
  • Electromechanical resonator apparatus
    Patent number: 4553060
    Abstract: A torsional-mode resonator is produced by using an extensional mode transducer on a piece of material such as a metal bar where the transducer lies at an angle between the longitudinal axis of the material and the transverse axis. Placing the midpoint of the transducer at approximately the midpoint of the material such as the bar, optimizes the torsional effect. Further optimization may be obtained by making the transducer in the shape of a rhomboid.
    Type: Grant
    Filed: November 21, 1983
    Date of Patent: November 12, 1985
    Assignee: Rockwell International Corporation
    Inventors: William J. Domino, Donald P. Havens, Robert A. Johnson
  • Mechanical filter with box-type coupling structure
    Patent number: 4405909
    Abstract: A mechanical bandpass filter of the cascaded flexure mode resonator bar type is provided with a coupling structure improving strength an reducing rigid-body spurious modes. Coupling wires are provided on both the top and bottom surfaces of the resonator bars, not just in a single plane.
    Type: Grant
    Filed: December 28, 1981
    Date of Patent: September 20, 1983
    Assignee: Rockwell International Corporation
    Inventors: Robert A. Johnson, Donald P. Havens