US Patent Issued to ETA SA Manufacture Horlogere Suisse on Jan. 27 for "Balance spring of a sprung balance assembly of a mechanical horological movement" (Swiss Inventors)

ALEXANDRIA, Va., Jan. 28 -- United States Patent no. 12,535,770, issued on Jan. 27, was assigned to ETA SA Manufacture Horlogere Suisse (Grenchen, Switzerland).

"Balance spring of a sprung balance assembly of a mechanical horological movement" was invented by Julien Christan (Bienne, Switzerland) and Raphael Courvoisier (Corcelles, Switzerland).

According to the abstract* released by the U.S. Patent & Trademark Office: "A balance spring (1) of a sprung balance assembly of a mechanical horological movement, formed by a succession of coils (S1.., Sn) which extend between a first free end, referred to as inner first coil (2), and a second free end, referred to as outer last coil (6). The are arranged off-centre when the balance spring is in ...