Patents by Inventor Van Ketel Hendrik

Van Ketel Hendrik 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).

  • Hoisting devices
    Patent number: 5114026
    Abstract: A hoisting device comprises a cable controlled at one end by a conventional crane winch assembly and at the other end by a traction winch assembly comprising traction device and storage winch. The hook is raised and lowered using the crane winch assembly and/or traction winch assembly depending upon whether the operation requires critical control or long haul travel.
    Type: Grant
    Filed: October 30, 1990
    Date of Patent: May 19, 1992
    Assignee: Heerema Group Services B.V.
    Inventor: Van Ketel Hendrik