Temperature compensated quartz wristwatch with memory stored predetermined temperature compensating data
US4321698A · kind A · utility
8Cited by
3References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 19, 1981 |
| Grant date | Mar 23, 1982 |
| Priority date | — |
| Expiry date | Jan 19, 2001 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03L1/028
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A quartz crystal wristwatch is temperature compensated by applying additional pulses to the divider circuit. The number and frequency of application of the additional pulses is stored in memory and based upon mean temperature data for the worn wristwatch on an hourly or monthly basis. The oscillator itself uses little or no temperature compensation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.