US Patent Issued to Otis Elevator on Sept. 1 for "Elevator machine braking" (Connecticut Inventors)

ALEXANDRIA, Va., Sept. 1 -- United States Patent no. 12,726,143, issued on Sept. 1, was assigned to Otis Elevator Co. (Farmington, Conn.).

"Elevator machine braking" was invented by Steven Michael Millett (Plainville, Conn.) and Prasanna Nagarajan (Farmington, Conn.).

According to the abstract* released by the U.S. Patent & Trademark Office: "An elevator drive configured to control power to an elevator motor includes a plurality of first (upper) inverter switches and a plurality of second (lower) inverter switches. A processor is configured to provide control signals to control operation of the inverter switches. A first signal buffer between the processor and the inverter switches is configured to selectively prevent any control signals ...