Patents by Inventor David J. Sawyer

David J. Sawyer 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).

  • Water vessel with propulsion arrangements having bi-directional flanking rudders with a profile for improved effectiveness
    Patent number: 11465723
    Abstract: One or more propulsion arrangements for water vessels, and in particular propulsion arrangements that include flanking rudders with bidirectional high-lift sections to improve performance, particularly in the reverse direction. The flanking rudders are positioned adjacent a propulsor for directing a slipstream flow when the vessel is travelling in the reverse direction. Each flanking rudder has an elongated profile extending from a first edge to a second edge, and in which each elongated profile has a first bulb portion, a convex middle portion, and a second bulb portion.
    Type: Grant
    Filed: December 18, 2020
    Date of Patent: October 11, 2022
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Jin Keun Choi, Christopher Paul Kent, Thad J. Michael, David J. Sawyer