Patents
Sitemap › H04 - Electric communication technique › H04M - Telephonic communication › H04M 9 - Arrangements for interconnection not involving centralised switching
Patents for H04M 9 - Arrangements for interconnection not involving centralised switching (8,105)
01/1986
01/28/1986CA1200034A1 Key telephone system signalling and control arrangement
01/28/1986CA1200033A1 Key telephone system signalling and control arrangement
01/28/1986CA1200032A1 Key telephone system signalling and control arrangement
01/14/1986US4564940 Broad band network system
01/14/1986US4564939 Handsfree telephone
01/14/1986US4564726 Pulse/direct current transmitting circuit in a key telephone system
01/14/1986US4564724 Terminal interface connecting terminal unit having central office line interface to key telephone system
01/08/1986EP0167351A2 Signal multiplexing circuit
12/1985
12/31/1985US4562573 Method and apparatus for adjusting channel insertion timing
12/31/1985US4562307 Transmitter-receiver station having low power consumption for a two-way communication link
12/24/1985US4560840 Digital handsfree telephone
12/24/1985US4560837 Call transfer method and circuitry
12/17/1985US4559417 Method of setting operating data in a key telephone system
11/1985
11/26/1985US4555596 Loudspeaking telephones
11/26/1985US4555592 Wireless hands-free conference telephone system
11/19/1985US4554413 Key telephone system
11/19/1985US4554411 Communication system
11/05/1985US4551583 Control signal transmission system for key telephone system
10/1985
10/22/1985US4549292 Method of efficiently and simultaneously transmitting both isochronous and nonisochronous data in a computer network
10/09/1985EP0157381A2 Circuit arrangement for a voice-controlled hands free subset
10/08/1985US4546214 Line use indicator for telephone sets sharing a single line
10/08/1985CA1195019A1 Additional line coupling circuit to an intercom telephone set
10/08/1985CA1195008A1 Method of, and a terminal for, transmitting bytes to a bus
10/02/1985EP0033744B1 Voice controlled switching system
10/02/1985EP0026187B1 Communication system tracking arrangement
10/01/1985US4545049 Private branch exchange having transmission channels commonly available to all stations
10/01/1985US4544808 Telephone indicator
09/1985
09/25/1985EP0155740A2 Loudspeaking telephone instrument
09/25/1985EP0155739A2 Loudspeaking telephone instrument
09/17/1985US4542263 For a telephone set
09/17/1985CA1193552A1 Voice-actuated switching system
09/04/1985EP0153838A2 Method of efficiently and simultaneously transmitting both isochronous and nonisochronous data in a computer network
09/03/1985US4539679 Synchronization in a communication network of interconnected rings
09/03/1985US4539437 Stored program power control system for improving energy efficiency for telephone sets connected into a local telephone communications system
09/03/1985CA1192992A1 Digital space phone system
08/1985
08/29/1985WO1985003829A1 Method of inserting and removing isochronous data into a sequence of nonisochronous data characters without slot allocation on a computer network
08/29/1985WO1985003828A1 Communication system having dynamically assigned station set buttons
08/29/1985WO1985003827A1 Method of efficiently and simultaneously transmitting both isochronous and nonisochronous data in a computer network
08/28/1985EP0153179A2 Method of inserting and removing isochronous data into a sequence of nonisochronous data characters without slot allocation on a computer network
08/28/1985EP0153140A1 Communication system having dynamically assigned station set buttons
08/27/1985US4538031 Service circuit for a local telephone line
08/27/1985US4538029 Apparatus for use with key telephone system with wireless telephone device
08/27/1985US4538028 Apparatus for use with key telephone system with wireless telephone device
08/20/1985US4536621 Dual talk path key telephone
08/20/1985US4536615 Key telephone equipment and associated method
08/13/1985US4535445 Conferencing system adaptive signal conditioner
08/13/1985US4535441 Communication system for stationary and mobile subscribers
07/1985
07/31/1985EP0150109A2 Apparatus for enhancing the use of electromechanical key telephone systems
07/23/1985CA1190984A1 Arrangement for avoiding undsirable oscillations in a closed-loop system and loud-speaking telephone set employing this arrangement
07/17/1985EP0148651A1 Low-energy consumption transmitter-receiver for a two-way link
07/02/1985US4527014 Loudspeaking telephone
06/1985
06/20/1985WO1985002746A1 Apparatus in digital telephone systems
06/19/1985EP0145437A2 Information transmission network
06/11/1985US4523056 Telephone including resistive array for dialing and system for using such telephone
06/11/1985CA1188831A1 Telephone indicator
05/1985
05/29/1985EP0142551A1 Variable bandwidth switching system
05/28/1985US4520235 Electronic key telephone system
05/28/1985CA1187969A1 Digital loop transceiver for interfacing a digital pabx to a digital subscriber set via a subscriber line
05/22/1985EP0141852A1 Integrated voice/data/control switching system
05/14/1985US4517409 Method for checking function states in key telephone system
05/07/1985US4516236 Full-duplex transmission of bit streams serially and in bit-synchronism on a bus between two terminals.
05/07/1985CA1186826A1 Loudspeaker telephone system
04/1985
04/30/1985US4514597 Control of a key telephone system using a pulse width modulated signal
04/30/1985US4514594 Power line carrier telephone extension system for full duplex conferencing between telephones and having telephone call hold capability
04/24/1985EP0137806A1 Speakerphone control circuit.
04/23/1985US4513413 Communication set and method
04/23/1985US4513177 Loudspeaking telephone system
04/23/1985CA1186082A1 Line circuit for multiple line telephone
04/16/1985US4511767 Key telephone system signalling and control arrangement
04/16/1985US4511766 Key telephone system signalling and control arrangement
04/02/1985CA1185024A1 Signalling in pbx systems
03/1985
03/26/1985US4507524 Loudspeaker telephone system
03/19/1985US4506381 Aural transmitter device
03/19/1985US4506346 Programmable cartridge telephone communication system
03/19/1985CA1184129A1 Arrangement for reducing the noise in a speech signal mixed with noise
03/12/1985US4504702 Additional line coupling circuit to an intercom telephone set
03/05/1985US4503532 Multipoint fiber optic junction terminal
02/1985
02/26/1985US4502138 Synchronization system for key telephone system
02/19/1985US4500991 Circuit arrangement for the control of the transmission of digital signals, particularly PCM-signals, between stations of a time division multiplex telecommunication network particularly PCM-time division multiplex telecommunication network
02/12/1985US4499338 Key telephone system signalling and control arrangement
02/05/1985US4497980 Handsfree circuit for telephone instrument
01/1985
01/29/1985US4496799 Handsfree telephone instrument using digital dial
01/22/1985CA1181541A1 Loudspeaking telephone
01/15/1985US4493950 Loudspeaker telephone
01/15/1985US4493949 Parallel operation of telephone equipment on a digital loop
01/15/1985CA1181187A1 Anti-larsen-effect arrangement in a telephone station equipped with a loudspeaker
01/09/1985EP0130553A2 Improvements in telephone instruments
01/08/1985US4493101 Anti-howl back device
01/08/1985US4492824 Speakerphone linear comparator
01/02/1985EP0129716A2 Arrangement for the transmission of digital signals
01/01/1985US4491693 Key telephone system and method of setting operating data in the key telephone system
12/1984
12/27/1984EP0129208A2 Handsfree circuit for telephone instrument
12/25/1984US4490820 Reception system for key telephone system
12/25/1984US4490583 Plural line telephone controller
12/25/1984US4490582 Speakerphone control circuit
12/19/1984EP0128416A2 Arrangement for the switchable transmission of audio signals
12/18/1984US4488772 Electro-optic indicating device
12/12/1984EP0127656A1 A telephone switching arrangement.
12/11/1984US4488007 Speech-amplifier telephone station
12/05/1984EP0126768A1 A memory cartridge for connection to a telephone switching arrangement.
1 ... 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82