Patents by Inventor Per Kristian Larsen

Per Kristian Larsen 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).

  • Patent number: 6591772
    Abstract: A slidable, impact absorbing keel device for sailing vessels. A vessel hull and a fin keel are attached to a mutually slidable hull connection member and a slidable keel connection member respectively. A tongue-and-groove connection slidably connects the hull and the keel. A compartment contains a spring and is in fluid communication with the surrounding water by means of a conduit. The keel is displaceable backwards if the vessel runs aground or comes into contact with an object below the water line. The keel will be displaced forward to its initial position by means of the compressed spring. The keel is selectively adjustable by means of a wire and tensioning device for purposes of regular maintenance and trimming the vessel by shifting the keel and thus the vessel's center of mass.
    Type: Grant
    Filed: November 26, 2001
    Date of Patent: July 15, 2003
    Inventors: Per Kristian Larsen, Nils Otto Holmen