Electronic time-piece with barometric indicator
US4257112A · kind A · utility
12Cited by
5References
18Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 23, 1979 |
| Grant date | Mar 17, 1981 |
| Priority date | — |
| Expiry date | Apr 23, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L9/08
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention concerns an electronic time-piece having a barometric indicator, indicating, for example, barometric trends. The time-piece comprises, in addition to the reference oscillator for determining the time, a measurement oscillator associated with a transducer exposed to the ambient air. A counter measures the variations of the frequency of the measurement oscillator due to the fluctuations of atmospheric pressure, and an electronic circuit controls, from predetermined detection thresholds, the indication of barometric trend on the display device of the time-piece.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.