ALEXANDRIA, Va., March 5 -- United States Patent no. 12,240,375, issued on March 4, was assigned to FEDERAL SIGNAL Corp. (Downers Grove, Ill.).
"Electronically controlled siren" was invented by Vincent S. Fleszewski (Crown Point, Ind.), Robert J. Hartke (Beecher, Ill.), Jeffery M. Loftus (Tinley Park, Ill.) and Christopher Radzik (New Lenox, Ill.).
According to the abstract* released by the U.S. Patent & Trademark Office: "An electronically controlled motor driven siren. The siren is electronically controlled to generate different sound profiles, while having advantages of a motor driven mechanical siren. In some embodiments, the siren is part of a system of multiple sirens. The phases of the rotors of the sirens of the system can be elec...