Patents by Inventor Denis J. Logan

Denis J. Logan 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 buoyancy buoy
    Patent number: 5460556
    Abstract: A variable buoyancy buoy includes a shell and expansion apparatus. The two are combined in a manner to provide a watertight structure with an internal region wherein a constant pressure is maintained that is substantially equal to the pressure at a predetermined depth below the water surface. At depths above the predetermined depth the internal pressure is greater than the external water pressure. This differential pressure causes the buoy to expand, thereby increasing its buoyancy.
    Type: Grant
    Filed: December 30, 1993
    Date of Patent: October 24, 1995
    Assignee: Loral Corporation
    Inventors: Denis J. Logan, Raymond W. Vopat