ALEXANDRIA, Va., Feb. 19 -- United States Patent no. 12,231,021, issued on Feb. 18, was assigned to Bayerische Motoren Werke AG (Munich).

"Rotor shaft of an electric motor" was invented by Daniel Loos (Unterschleissheim, Germany) and Yann Tremaudant (Munich).

According to the abstract* released by the U.S. Patent & Trademark Office: "A rotor shaft of an electric motor, in particular of an electrically excited synchronous machine, is composed of a shaft body and a power transmission module, the shaft body having a tubular open end that faces the power transmission module and forms a seat in which an end of the power transmission module located closer to the shaft body is interlockingly accommodated in the seat."

The patent was filed on Ma...