Patent #4,672,905 filed 6/6/86, date of patent 6/16/87:  The XT hull (in-depth).

    Patent #4,907,520 filed 6/1/88, date of patent 3/13/90:  Tunnel hull with "anti-spin sponson" design (in-depth).

    Patent #D285,190 filed 11/28/84, date of patent 8/19/86: XT hull (sketches).

    Patent #D302,969 filed 10/19/87, date of patent 8/22/89: The ZT hull (sketches).

    Patent #D307,574 filed 1/11/88, date of patent 5/1/90: The HST (sketches).