Power line carrier multi telephone extension system for full duplex conferencing between telephones
US4475193A · kind A · utility
140Cited by
4References
33Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 30, 1982 |
| Grant date | Oct 2, 1984 |
| Priority date | — |
| Expiry date | Sep 30, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2203/5437
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
In a power line carrier telephone extension system for transmitting electrical signals between the telephone line and an extension telephone over the AC electric power line available at a telephone subscriber's premises, that includes a main station for processing signals between the subscriber's telephone line and power lines and an extension telephone of the system that plugs into the power line, means that provides for a plurality of such extension telephones all of which can place calls to the telephone line, answer calls from the telephone line and conference together in full duplex communication.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.