ALEXANDRIA, Va., June 4 -- United States Patent no. 12,320,551, issued on June 3, was assigned to JOHNSON CONTROLS LIGHT COMMERCIAL IP GMBH (Neuhausen am Rheinfall, Switzerland).

"Variable capacity furnace control" was invented by Andrew M. Boyd (Wichita, Kan.), Tom R. Tasker (Andover, Kan.) and Rakesh Mathew (Wichita, Kan.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A variable capacity furnace includes a variable capacity fuel valve configured to supply a fuel to a burner, where the variable capacity fuel valve is configured to be controlled to a target setting over a range of settings to modulate an amount or flow rate of the fuel supplied to the burner. The variable capacity furnace also includes a con...