Sailboard

The Sailboard was surfer Oscar van der Kirk's invention of placing a sail on his surfboard when he was given the idea while he was fishing on his surfboard during Hawaii's Japanese-occupation. Oscar proposed his radical invention to Eizo Doi, who he was tasked in creating the sailboard. The invention became a success and wonder to the people on the island when Oscar first successfully tested it.

But unfortunately, van der Kirk couldn't patented his creation as sailboards appeared all over the island in short order. Thus making it impossible to prove his claim to the sailboard.