The first U.S. patent for a polyethylene plastic portable restroom was issued in the 1960s to George Harding, who co-founded PolyJohn Enterprises Corporation with Ed Cooper and George Hiskes. Patent number 3,447,167 described a portable toilet cabana that would be made out of a rigid plastic rather than wood or metal,

Harding was the consummate entrepreneur. During the 1930s, he was in senior management with the General Motors Corporation. In the 40s, Harding played an important role in the U.S. War Department as a senior official in the Department of Strategic Metals, where he worked in building the Liberty Ships. In the 1950s, Harding entered the burgeoning fiberglass boat industry and also started an underwater photography business with Walt Disney as a partner.

At a time in his life when most men would have been satisfied with retirement, George Harding became interested in the brand new field of plastics. In researching practical uses for this new “wonder material,” he invented the polyethylene portable toilet. Harding became the number-one salesman for his new invention, traveling throughout the U.S. and Canada with two toilet units on a trailer pulled behind his car.