Self-compensating spiral for a spiral balance-wheel in watchwork and process for treating this spiral
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United States of America Patent
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Jan 7, 2003
Grant Date -
Dec 6, 2001
app pub date -
Aug 3, 2001
filing date -
Mar 26, 1999
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Abstract
This self-compensating spiral for a mechanical spiral balance-wheel oscillator in watchwork or other precision instrument, made of a paramagnetic alloy, contains at least one of the elements Nb, V, Ta, Ti, Zr, Hf and is covered with a substantially uniform oxide layer having a thickness greater than or equal to 20 nm, formed by subjecting the said spiral to an anodizing treatment.
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