LiquidPiston is an American company that develops and licenses advanced rotary internal combustion engines. The company's engines are designed to be more efficient and compact than traditional piston engines, with the potential to reduce fuel consumption and emissions. LiquidPiston's engines are based on the company's patented High Efficiency Hybrid Cycle (HEHC) technology, which combines elements of the Otto, Diesel, and Atkinson cycles to achieve high thermal efficiency. The company's engines have potential applications in a variety of industries, including automotive, aerospace, and military.