Matches 1 - 14 out of 14
Match Document Document Title
5937334 Radio communications and telephone network interface system  
A phone patch 26 for interfacing between a radio 12 and a telephone network 32 includes means for electrically coupling audio signals between the radio 12 and the telephone network 32. A monitoring...
5758289 Telephone system and bell sound detecting method thereof  
A relay lifter comprises a hook switch unit for turning ON/OFF a hook switch in response to a talk switch, a voice switching unit for switching connection of an aural signal in said corded...
5732355 Telephone system  
The is provided by the present invention a telephone system with high versatility comprising a corded telephone set, a cordless telephone set, and a relay lifter, wherein said relay lifter...
4082919 Interconnect control for automatically connecting a simplex or half-duplex radio network to a standard telephone system  
An interconnect circuit arrangement for patching a simplex or half-duplex radio network into a standard telephone system. It includes means for sending beep tones to the parties at the end of each...
RE29183 Telephone range expander  
An extension telephone is coupled to a telephone line through a control unit which receives and forwards by radio incoming calls and is fully controlled from the extension unit for outgoing calls....
4013956 Telecommunication system with automatically switched modems  
A telecommunication system in which two terminal stations are coupled to one another via a telephone exchange and the transmission paths between the exchange and the terminal stations are provided...
3745462 MOBILE RADIO EXTENSION INTERFACE FOR CONVERTING CONVENTIONAL TRANSMIT/RECEIVE TO A REPEATER  
A unit connectable to a conventional transmitter and receiver to convert them for use as a repeater or transponder with provision for automatically inhibiting multiple transmissions by units within...
3743936 DATA TRANSMISSION SYSTEM ON ONE LINE  
A data transmission having a central unit and data points grouped in satellite stations. The selection of any data point is performed by: transmitting from the central unit a combination of four...
3614326 TELEPHONE ACTUATED SWITCH  
An electronic switch serving as a communications link between a remotely situated telephone caller and a headquarters. The communications link is adapted to connect a two-way radio to the telephone...
3557312 REMOTE TELEPHONE EXTENSION SYSTEM  
The system allows one to answer his telephone and talk to the caller by means of a remote transceiver which is carried by the person when he is away from his telephone. A base station unit develops...
3532822 REMOTE CONTROL SYSTEM OPERATED OVER TELEPHONE LINE  
3446976 TELEPHONE OPERATED OPTOELECTRONIC VOLUME CONTROL  
3366744 Remote telephone extension system  
3299207 Sound reproducer with means for attachment to a telephone handpiece  
Matches 1 - 14 out of 14