ALEXANDRIA, Va., April 15 -- United States Patent no. 12,601,422, issued on April 14, was assigned to BELIMO Holding AG (Hinwil, Switzerland).

"Monitoring an operating condition of an HVAC flow regulator" was invented by Frank Lehnert (Ruti, Switzerland), Marc Thuillard (Uetikon am See, Switzerland), Silvio Grogg (Wetzikon, Switzerland), Pascal Hertrich (Zurich, Switzerland), Patrick Reissner (Herrliberg, Switzerland), Urs Niederhauser (Pfungen, Switzerland) and Lukas Eigenmann (Aathal-Seegraben, Switzerland).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method of detecting an operating condition of a controllable flow regulator in a fluid flow channel of an HVAC system, comprising transmitting a sonic sig...