Patents by Inventor S. Dirk Kramers

S. Dirk Kramers 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).

  • Boom for sailing vessel
    Patent number: 5181477
    Abstract: A boom for a sailing vessel has a forked forward portion hinged to the mast at spaced locations to permit rotation or swinging of the boom only in a horizontal plane.
    Type: Grant
    Filed: February 13, 1992
    Date of Patent: January 26, 1993
    Assignee: Harken, Inc.
    Inventors: Olaf T. Harken, Eric R. D. Hall, S. Dirk Kramers