On July 20, 1999, Dennis Olsen received U.S. Patent No. 5,924,732, on an In-Line Skate Sail:
Others with a similar disregard for personal safety invented personal sail-powered systems, for example, Budge’s U.S. Patent No. 3,982,766 on a Wind-Propelled Skateboard:
and Lornenz, U.S. Patent No. 4,130,292, Apparatus for Propelling a Skate Board with Wind Currents:
But Olsen’s idea was to keep the sail above the user’s head.





















