ALEXANDRIA, Va., Jan. 13 -- United States Patent no. 12,523,304, issued on Jan. 13, was assigned to The Metraflex Co. (Chicago).
"Butterfly valve" was invented by Daniel T. Holbach (Kildeer, Ill.), Jackson Kamedulski (Chicago), James D. Clauss (Frankfort, Ill.), Jay R. Johnson (Chicago), James Reynold Richter (Chicago) and Devin Rivera (Melrose Park, Ill.).
According to the abstract* released by the U.S. Patent & Trademark Office: "A butterfly valve with separate adjustment mechanisms. An apparatus comprising a locking plate comprising one or more locking grooves oriented on a first side of the locking plate and a circumferential opening oriented on a second side of the locking plate opposite the first side, a handle extending radially ou...