ALEXANDRIA, Va., Nov. 6 -- United States Patent no. 12,460,640, issued on Nov. 4, was assigned to Industrial Technologies and Services LLC (Davidson, N.C.).

"Complex screw rotors with a central circular cross section connecting right-hand left-hand sections of the rotors" was invented by Luke Gray (Loraine, Ill.), Taylor Stratman (Quincy, Ill.), Bernard Conley (Palmyra, Mo.), Brent Ransdell (Warsaw, Mo.) and Daniel Peana (Springfield, Mo.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A compressor design includes a male rotor (10) having one or more helical lobes (12) and a female rotor (14) having one or more helical grooves (16). The male rotor is mounted on a first shaft and the female rotor is mounted on...