US Patent Issued to The Swatch Group Research and Development on Oct. 6 for "Device for autonomously adjusting the active length of a balance spring" (Swiss Inventors)

ALEXANDRIA, Va., Oct. 6 -- United States Patent no. 12,754,514, issued on Oct. 6, was assigned to The Swatch Group Research and Development Ltd (Marin, Switzerland).

"Device for autonomously adjusting 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 autonomously adjusting the active length of a balance spring (5), for an oscillator (4, 5) of the sprung balance type, including a cock (12) mounted on a plate (13) of a horological movement (2) and in which cock a balance staff pivots, the balance spring (5) including an inner end integral with t...