ALEXANDRIA, Va., June 10 -- United States Patent no. 12,291,428, issued on May 6, was assigned to Inventio AG (Hergiswil, Switzerland).
"Control device for a passenger transport system" was invented by Alexander Prenner (Pottsching, Austria).
According to the abstract* released by the U.S. Patent & Trademark Office: "An electrical control device for controlling the drive of a passenger transport system which can be switched between load operation and idle operation is described. The electrical control device includes at least a three-phase mains voltage connection, a frequency converter, and a controllable switching device. The switching device can couple the three phases of the drive motor to the three phases of the mains voltage connect...