I'm very confused why the name of the company is LiquidPiston, when their primary product appears to be a rotary engine, not an actual liquid piston engine. Wa

I'm very confused why the name of the company is LiquidPiston, when their primary product appears to be a rotary engine, not an actual liquid piston engine. Was there a pivot or a previous product? Does anyone know? For examples of actual liquid piston engines, see: https://en.wikipedia.org/wiki/Fluidyne_engine https://en.wikipedia.org/wiki/Fluidyne_engine https://en.wikipedia.org/wiki/Humphrey_pump https://en.wikipedia.org/wiki/Humphrey_pump https://en.wikipedia.org/wiki/Pulsometer_pump https://en.wikipedia.org/wiki/Pulsometer_pump http://www.google.com/patents/US5127369 http://www.google.com/patents/US5127369