US Patent Issued to The Swatch Group Research and Development on Aug. 11 for "Device for autonomous adjustment of the active length of a balance spring" (Swiss Inventors)

ALEXANDRIA, Va., Aug. 12 -- United States Patent no. 12,704,812, issued on Aug. 11, was assigned to The Swatch Group Research and Development Ltd (Marin, Switzerland).

"Device for autonomous adjustment of the active length of a balance spring" was invented by Paulo Bravo (Marin-Epagnier, Switzerland) and Andres Cabezas Jurin (Yverdon-les-Bains, Switzerland).

According to the abstract* released by the U.S. Patent & Trademark Office: "A device (6) for autonomous adjustment of the active length of a spiral (5), for a balance-spiral type oscillator (4, 5), including a cock (12) mounted on a plate (13) of a horological movement (2) and in which a balance shaft pivots, the spiral (5) including an inner end secured to the balance shaft and an ou...