Cordless telephone system
US4661970A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | May 28, 1986 |
| Grant date | Apr 28, 1987 |
| Priority date | — |
| Expiry date | May 28, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/72505
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A cordless telephone system includes a plurality of radiophones, each having a first transmitter and a first receiver of different transmission and reception frequencies; and a radio station, wired to a telephone line. The radio station comprises a second receiver and a second transmitter, each having the same reception and transmission frequencies as those of the radiophones; switching means for connecting an input terminal of the second transmitter and an output terminal of the second receiver to the telephone line, or for connecting the input terminal of the second transmitter and the output terminal of the second receiver; and control means for receiving a control signal from the second receiver and supplying a control signal to the switching means. Half duplex communication can be performed between the radiophones.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.