ALEXANDRIA, Va., March 3 -- United States Patent no. 12,565,401, issued on March 3, was assigned to Otis Elevator Co. (Farmington, Conn.).
"Elevator switch monitoring device" was invented by Ben Guo (West Hartford, Conn.) and Zhenhong Li (Farmington, Conn.).
According to the abstract* released by the U.S. Patent & Trademark Office: "An illustrative example embodiment of a switch monitoring device includes a controller configured to command a switch to enter at least one of a conducting state and a non-conducting state. A monitoring circuit conducts current when the switch is in the conducting state. A comparator provides an output indicating a relationship between a voltage of a selected portion of the monitoring circuit and a threshold v...