Central office interface circuit
US4369337A · kind A · utility
3Cited by
4References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 5, 1980 |
| Grant date | Jan 18, 1983 |
| Priority date | — |
| Expiry date | May 5, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/738
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An interface circuit for interconnection between a central office line and a telephone apparatus (e.g. telephone set, automatic telephone answering machine, etc.) is disclosed. The interface circuit includes a rectifier which allows the interface circuit to be connected across the central office line, in parallel with other interface circuits, without the use of isolation switches.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.