ALEXANDRIA, Va., Aug. 12 -- United States Patent no. 12,704,089, issued on Aug. 11.

"Double crankshaft reciprocating engine" was invented by Shufeng Fang (Tianjin, China).

According to the abstract* released by the U.S. Patent & Trademark Office: "The present invention discloses a double crankshaft reciprocating engine comprising a cylinder assembly and a double crankshaft transmission system. The cylinder assembly comprises a cylinder, a piston and a displacer. An intake valve is provided at the top of the cylinder. The piston is mounted in the cylinder and forms a combustion chamber with an inner wall of the cylinder located above the piston; the displacer is mounted below the piston, and a space between the displacer and the piston is ...