Battery powered electronic counter
US4304988A · kind A · utility
1Cited by
8References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 31, 1979 |
| Grant date | Dec 8, 1981 |
| Priority date | — |
| Expiry date | Jul 31, 1999 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K21/38
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A battery powered electronic counter with an electronic accumulator (12), a switch (22) for resetting the accumulator (12) and disconnecting the battery (20), and an accumulator indexing circuit with a first pair of switch input terminals (28) having separate high and low impedance connections to the battery (2) for minimizing battery drain and reducing input signal noise sensitivity, a second pair of AC/DC input terminals (30) for receiving an input pulse of up to 250 volts and a transistor circuit with a transistor (74) and a resistor (76) for limiting the current through an optical isolator (68) for the AC/DC terminals (30).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.