Patents by Inventor Fredlee M. McNall

Fredlee M. McNall 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).

  • Shaft dampening apparatus
    Patent number: 4406642
    Abstract: An electrically conductive ring is secured to a rotating shaft electrically insulated therefrom at or near the shaft location at which the maximum amplitude of lateral vibration is anticipated. Providing a transverse magnetic field contiguous to the ring periphery is at least one pair of spaced magnets. The magnetic field imposed by the magnets is effective when vibrationally penetrated by the ring to induce an electrical current in the ring causing energy dissipation that repels the amplitude of the shaft.
    Type: Grant
    Filed: April 13, 1981
    Date of Patent: September 27, 1983
    Assignee: Dresser Industries, Inc.
    Inventor: Fredlee M. McNall