Indicator for the condition of a battery operating a timepiece
US3993985A · kind A · utility
37Cited by
7References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1974 |
| Grant date | Nov 23, 1976 |
| Priority date | — |
| Expiry date | Apr 29, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04C10/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention relates to an indicator for the condition of a battery and more particularly for a battery with voltages between 1 and 3 Volts. The indicator comprises an electronic device in which a stable reference voltage is provided by a semi-conductor device compensated in temperature by the combination of a diode voltage with a multiple of the difference between two other diode voltages, and a positive feedback circuit which drives a passive display device according to the condition of the battery.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.