Electric alarm watch
US3977177A · kind A · utility
4Cited by
3References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 27, 1975 |
| Grant date | Aug 31, 1976 |
| Priority date | — |
| Expiry date | May 27, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04C21/20
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The invention concerns, in particular, an electric wristwatch having an alarm device. In accordance with the invention, the impulses produced for driving the electric movement in the watch are, also, used for operating or controlling the signal-source to the alarm device. For example, in an electric quartz watch the impulses can be extracted from any chosen stage of the frequency divider and after amplificaton can be used to control the signal-source to a buzzer. It is the low pulse repetition frequency of the driving impulses, in balance wheel type watches, which leads to a distinctive signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.