US Patent Issued to ETA SA Manufacture Horlogere Suisse on Sept. 16 for "Control circuit of a stepper motor capable of detecting an external magnetic field" (Swiss Inventor)

ALEXANDRIA, Va., Sept. 17 -- United States Patent no. 12,418,254, issued on Sept. 16, was assigned to ETA SA Manufacture Horlogere Suisse (Grenchen, Switzerland).

"Control circuit of a stepper motor capable of detecting an external magnetic field" was invented by Joerg Berthoud (Villeret, Switzerland).

According to the abstract* released by the U.S. Patent & Trademark Office: "A control circuit of a timepiece motor (2), including a bipolar permanent magnet (6), a stator (4) defining two isthmi (12a & 12b) and two rest positions for the rotor, and a coil (18) mounted on the stator. The control circuit can determine the position of the rotor at rest. An electric pulse generator (22) for detecting an external magnetic field formed by a circu...