Patents by Inventor Willem Hendrik Den Ouden

Willem Hendrik Den Ouden 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).

  • Stern screw for a vessel as well as a vessel provided with such a stern screw
    Patent number: 5704306
    Abstract: A stern screw has a tunnel tube inside which a propeller is rotatable about a shaft. The propeller is driven by a drive motor at least during operation. The stern screw is placed entirely below water level. For this purpose, the tunnel tube has an opening for accommodating therein an intermediate part which is profiled at a first side, forming part of the wall of the tunnel tube, and at an opposite side is provided with a flange for fastening to an outside of a stern of the boat. The intermediate part has a cavity in which a drive shaft is accommodated by which the propeller is driven. The drive motor is mounted in its entirety on the inside of the stern.
    Type: Grant
    Filed: December 15, 1995
    Date of Patent: January 6, 1998
    Assignee: Vetus Den Ouden N.V.
    Inventor: Willem Hendrik Den Ouden