Balance-spring for horological movement and method for manufacturing same
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United States of America Patent
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Oct 1, 2024
Grant Date -
Jul 1, 2021
app pub date -
Oct 29, 2020
filing date -
Dec 31, 2019
priority date (Note) -
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Abstract
A balance-spring intended to equip a balance of an horological movement, comprising a core made of Nb—Ti made from an alloy consisting of: niobium: balance to 100% by weight, titanium: between 5 and 95% by weight, traces of elements chosen from the group consisting of O, H, C, Fe, Ta, N, Ni, Si, Cu, Al, each of said elements being present in a quantity between 0 and 1600 ppm by weight, the total quantity formed by all of said elements being between 0% and 0.3% by weight, wherein the core made of Nb—Ti is coated with a layer of niobium, said layer of niobium having a thickness between 20 nm and 10 μm.
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