ALEXANDRIA, Va., March 17 -- United States Patent no. 12,578,109, issued on March 17, was assigned to TYCO FIRE & SECURITY GMBH (Neuhausen am Rheinfall, Switzerland).

"Systems and methods to mitigate infection risk using air purification" was invented by Jonathan D. Douglas (Mequon, Wis.), Kirk H. Drees (Cedarburg, Wis.) and Michael J. Risbeck (Madison, Wis.).

According to the abstract* released by the U.S. Patent & Trademark Office: "A method for providing filtered air to a zone of a building includes operating an air handler to pass unfiltered air through a filter and output filtered air to the zone of the building. The method includes determining an amount of filtered air provided to the zone of the building by the air handler. The met...