Patents by Inventor David V. Humpherson

David V. Humpherson 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).

  • Circulation control aerofoils
    Patent number: 5529458
    Abstract: A circulation control aerofoil having an internal chamber for receiving during operation air for exhaust through a circulation control air exhaust slot defined by spaced-apart slot lips is provided with a plurality of actuators of electrically deformable material adapted during operation to cause local bending of the aerofoil structure to which they are attached to selectively adjust the width of the air exhaust slot. The actuators may be piezo-electric actuators.
    Type: Grant
    Filed: August 18, 1994
    Date of Patent: June 25, 1996
    Assignee: Westland Helicopters Limited
    Inventor: David V. Humpherson