H04M 1 - Substation equipment, e.g. for use by subscribers

Patents for H04M 1 - Substation equipment, e.g. for use by subscribers (168,223)
01/1988
01/07/1988	EP0251613A2 A keyboard security device
01/07/1988	EP0251296A2 Portable communication terminal for remote data query
01/07/1988	EP0251238A2 Armored cord handset
01/07/1988	DE3633561C1 Change-over switching device for a telephone facility for connecting a number of extensions to a common telephone line
01/07/1988	DE3620925A1 Method for user guidance on a digital telephone station
01/05/1988	US4718085 Telephone cord groove and cord retaining means
01/05/1988	US4718083 Differential receive booster amplifier for telephone instruments
01/05/1988	US4718057 Streamlined digital signal processor
12/1987
12/29/1987	US4716262 Vandal-resistant telephone keypad switch
12/23/1987	DE3620857A1 Cordless telephone
12/23/1987	CN86208891U Duplex selective calling telephone system making use of low voltage power line carrier wave
12/22/1987	US4715062 Speakerphone control circuit having low gain states and method for controlling gain of speakerphone
12/22/1987	US4715060 Door message apparatus with telephone answering device
12/17/1987	WO1987007800A1 Telephone security system
12/17/1987	WO1987007799A1 A telephone line monitoring system
12/17/1987	WO1987007798A1 Ergonomic telephone
12/16/1987	EP0249076A1 Device for protecting a user when coming in contact with an electrical apparatus placed in an insulated housing
12/16/1987	CN86210205U Multi-functional telephone system for mine district
12/15/1987	US4713836 Telephone set structure having a member capable of being inserted in invertible position
12/15/1987	US4713835 Telephone answering machine with automatic recording and visual display of time and data
12/15/1987	CA1230438A1 Excluder device for telephones installed in parallel
12/15/1987	CA1230437A1 Loudspeaking telephone instrument
12/12/1987	CN86210722U Silver-saving longitudinal spring for wire connector of telephone exchange
12/10/1987	DE3619165A1 Device for blocking the connection set-up of a telecommunications device
12/09/1987	EP0248351A2 Cordless telephone system
12/08/1987	US4712236 Telephone handset construction
12/08/1987	US4712234 Multi-purpose modular jack connecting block
12/08/1987	US4712230 Monitoring and recording apparatus for connection to a telephone line
12/08/1987	US4712229 Multiple access radio telephone system selectively operating on full-duplex and half-duplex modes
12/03/1987	WO1987007460A1 Voice activated telephone
12/03/1987	DE3633562C1 Change-over switching device for a telephone facility for connecting a number of extensions to a common telephone line
12/03/1987	DE3616113A1 Electronic device having a magnetic apparatus holder with a signal transmitter contact
12/02/1987	CN87103711A Membrane keyboard
12/01/1987	US4710954 Telephone set line switch
12/01/1987	US4710950 Automatic telephone answering apparatus with recorded cue signals separating each incoming message
12/01/1987	US4710596 Telephone unit adapted for vertical and horizontal mounting
12/01/1987	CA1229936A1 Multifunctional telephone
11/1987
11/26/1987	DE3617367A1 Circuit arrangement for a telephone subscriber station
11/24/1987	US4709389 Telephone hook switch with elastomeric contact member
11/24/1987	US4709387 Multifunctional telephone
11/24/1987	US4709201 Portable radio battery pack with on-off switch
11/19/1987	WO1987007103A1 Telephone instruments
11/19/1987	EP0245709A1 Calling device for a building and persons including a name list
11/19/1987	DE3616368A1 Method and device for dialling a telephone subscriber with a mobile radiotelephone device, in particular a carphone installed in a motor vehicle
11/19/1987	DE3616314A1 Telephone set with hands-free device
11/17/1987	US4707855 Personalized telephone signaling circuitry and device, and methods of constructing and utilizing same
11/17/1987	US4707854 Telephone with digit cancellation
11/17/1987	US4707851 For a telephone line
11/17/1987	US4707850 Test apparatus for a subscriber line
11/17/1987	CA1229443A1 Latching relay drive circuit for use in telephone sets
11/12/1987	DE3615522A1 Telephone set
11/11/1987	EP0244872A2 Base station capable of monitoring occurrence of interference on every transmission
11/11/1987	EP0244756A2 Communication terminal apparatus
11/11/1987	EP0150183B1 Method and apparatus for providing call tracing service
11/11/1987	CN86103152A Remote dialing apparatus for joining common-frequency simplex radio telephone into automatic duplex wire telephone network
11/10/1987	US4706274 Cordless telephone system
11/10/1987	US4706085 Apparatus and method for generating multi-digit codes
11/10/1987	CA1229186A1 Protection circuitry for subscriber's telephone circuit equipped with repertory memory
11/10/1987	CA1229134A1 Signal transmitting and/or receiving apparatus
11/07/1987	CN86208673U Number converter of crossbar user switchboard
11/05/1987	WO1987006787A1 Telephone protection circuit
11/05/1987	DE3614948A1 Dialling restriction for a telephone device
11/05/1987	DE3611533C1 Installation frame for a telephone set
11/04/1987	EP0243900A2 Radio key telephone system having a common signaling channel
11/04/1987	EP0243899A2 Battery-saving method for a cordless telephone system
11/03/1987	CA1228947A1 Telephone serving as both table mounted type and wall hung type
10/1987
10/29/1987	DE3714119A1 Digitales fernsprechsystem Digital automatic telephone system
10/28/1987	EP0242770A2 Method for realizing different processes in a digital telecommunication terminal adapted to speech and data transmission
10/28/1987	EP0242630A2 Telephonic apparatus using an optical display
10/28/1987	EP0242541A2 Circuit arrangement for a pulse generation telephone apparatus
10/28/1987	CN86204850U Manual dispatchine exchanger for mine
10/27/1987	US4703499 Distributed privacy oriented telephone extension system
10/27/1987	US4703498 Message playback control system for telephone answering machine
10/27/1987	US4703477 Packet information field data format
10/27/1987	US4703324 System identification in communications system
10/27/1987	CA1228686A1 Display device for telephone or the like electric appliance
10/22/1987	DE3613387A1 Method for connecting housing parts
10/21/1987	CN87201807U Safety spark-type electronic telephone for mine
10/21/1987	CN87100774A Circuit for switching between balanced networks
10/20/1987	US4701947 Circuit arrangement for suppressing interference signals on the receiving arm of a telephone subscriber line circuit
10/20/1987	US4701749 Electroacoustic calling device with universal bearing supporting a sound aperture closure member
10/15/1987	DE3611226A1 Circuit arrangement for a telephone set
10/14/1987	EP0102946B1 Gain regulation circuit
10/14/1987	CN87200144U Box-like two in one: receiver and microphone
10/13/1987	US4700385 Remote telephone control apparatus
10/13/1987	US4700384 Indoor telephone line demarcation box having several compartments
10/13/1987	US4700383 Lock-releasing mechanism for telephone set with muting function
10/13/1987	US4700377 Selectively actuable electronic apparatus
10/13/1987	US4700376 Automatic telephone answering apparatus with remote control signal muting
10/13/1987	US4699592 Rotatable connector
10/13/1987	US4699591 Rotatable connector
10/13/1987	CA1228185A1 Subscriber's line closing circuit
10/13/1987	CA1228150A1 Communications headset
10/07/1987	EP0239810A2 Pager receiver helpful for effective use of call numbers
10/07/1987	EP0239675A2 Method to prevent eaves-dropping at cordless telephones
10/06/1987	US4698618 Keyboard with arrays of function keys
09/1987
09/30/1987	EP0239503A1 Method and installation for the supervision of communications, especially telephone communications
09/30/1987	EP0239455A1 Device for preventing violation of a telephone line
09/30/1987	EP0239093A2 Multiple access radio telephone system selectively operating on full-duplex and half-duplex modes
09/29/1987	US4697283 Telephone handset with integrated flux coil

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