ALEXANDRIA, Va., Feb. 26 -- United States Patent no. 12,234,822, issued on Feb. 25.
"Compressor formed by identical rotors with circular arcs" was invented by Yaode Yang (Fresh Meadows, N.Y.).
According to the abstract* released by the U.S. Patent & Trademark Office: "An apparatus has a housing having a prismatic interior chamber with a base of a shape of two partially overlapping circles; a first rotor and a second rotor rotatably fit in the prismatic interior chamber. The first rotor and the second rotor are configured to rotate in the same direction. The first rotor and the second rotor are prismatic in shape and the base of the first rotor has a first circular arc and a second circular arc. The first circular arc and the second circul...