Patents by Inventor Robert Trautwein

Robert Trautwein 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).

  • Foldable kayak
    Patent number: 4057865
    Abstract: A rigid bottom foldable on a central transverse hinge has a removable tubular skeleton frame at each end supporting the skin. A pneumatic tubular member carried by the bottom sections serves to expand and tightly support the skin in use, thereby retaining the frame in assembled relation to the bottom.
    Type: Grant
    Filed: June 30, 1976
    Date of Patent: November 15, 1977
    Inventor: Robert Trautwein