Patents by Inventor Ralph Fenn

Ralph Fenn 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).

  • Narrow band controller
    Patent number: 5901233
    Abstract: A narrow band controller for suppressing disturbances from a source responsive to an input signal representative of the frequency spectrum of a disturbance from the source and providing an output signal having a similar frequency spectrum as the frequency spectrum of the input signal based on the input signal including delay logic for delaying, for a period of time, the received input signal for assuring the output signal has a phase different than the phase of said input signal.
    Type: Grant
    Filed: April 19, 1996
    Date of Patent: May 4, 1999
    Assignee: SatCon Technology Corporation
    Inventors: Richard Hockney, Ralph Fenn, Bruce Johnson, Monique Gaffney
  • System and method for damping narrow band axial vibrations of a rotating device
    Patent number: 5291975
    Abstract: A system and method for damping narrow band axial vibrations of a rotating device in which a reaction mass is coupled to the rotating device and a reaction mass actuator is employed to move the reaction mass axially along the rotating device. An effect of vibrations on the rotating device is then measured, and in response the reaction mass is moved axially to damp the effect of vibrations and so the vibrations.
    Type: Grant
    Filed: October 27, 1992
    Date of Patent: March 8, 1994
    Assignee: SatCon Technology Corporation
    Inventors: Bruce G. Johnson, Richard Hockney, David Eisenhaure, Ralph Fenn