Electronic timepiece
US4023345A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 25, 1975 |
| Grant date | May 17, 1977 |
| Priority date | — |
| Expiry date | Nov 25, 1995 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG04F10/04
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A digital display electronic stop-watch control circuit for facilitating the control of the start, stop, lap and reset functions in an electronic stop-watch is provided. The control circuit is provided for use in an electronic timepiece having counter circuitry for producing elapsed time signals, memory circuitry for storing said elapsed time signals and display circuitry for displaying either elapsed time or stored time in response to the elapsed time signals produced by the counter circuitry or in response to the stored time signals produced by the memory circuitry being respectively applied thereto. The control circuit of the instant invention is characterized by being coupled to the counter circuitry, memory circuitry and digital display circuitry. First and second manually operated switching circuits are respectively coupled to the control circuit. The control circuit in response to an initial actuation of the first switching circuit starts the count of the counter circuit and in response to the next actuation of the first switching circuit inhibits the count of the counter circuit. The control circuit, in response to an initial actuation of the second switching circuit when s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.