Switching assembly in combination wristwatch and calculator
US4055755A · kind A · utility
39Cited by
7References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1976 |
| Grant date | Oct 25, 1977 |
| Priority date | — |
| Expiry date | Apr 15, 1996 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/967
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
In a combination wristwatch and calculator, a key input means for information entry employs a touch sensitive electronic switching circuitry comprising a C-MOS inverter. One electrode for the touch sensitive electronic switching circuitry is provided on the front panel of the combination wristwatch and calculator, whereas another electrode for the touch sensitive electronic switching circuitry is positioned on the rear surface of the combination wristwatch and calculator. The present key input means is equally applicable to a miniature electronic calculator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.