Self-compensating balance spring for a mechanical oscillator of a balance-spring/balance assembly of a watch movement and process for manufacturing this balance-spring
US5881026A · kind A · utility
30Cited by
1References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 17, 1998 |
| Grant date | Mar 9, 1999 |
| Priority date | — |
| Expiry date | Jun 17, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04B17/227
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A self-compensating spring for a balance-spring for a balance-spring/balance assembly of a mechanical oscillator of a horological movement or of any other precision instrument, made of a paramagnetic Nb--Zr alloy containing between 5% and 25% by weight of Zr, obtained by cold rolling or cold drawing, and having a Young's modulus whose temperature coefficient (TCY) is adjustable by precipitation of Zr-rich phases in the Nb--Zr solid-solution. It contains at least 500 ppm by weight of an interstitial doping agent at least partly formed of oxygen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.