Patents
Sitemap › H04 - Electric communication technique › H04M - Telephonic communication › H04M 19 - Current supply arrangements for telephone systems
Patents for H04M 19 - Current supply arrangements for telephone systems (7,475)
10/1998
10/06/1998CA2042676C Ringing signal control circuit for an enhanced subscriber line interface
10/01/1998DE19713174A1 Power supply method for time-multiplexed communications terminal
09/1998
09/30/1998EP0868033A2 Device for detecting active mobile phones
09/30/1998EP0867844A2 A communication device with different call announcements according to the caller's identity
09/30/1998EP0866979A2 Method for displaying a "low battery" state in electrical equipment with electrical energy stores and electrical equipment with electrical energy stores with means for displaying a "low battery" state
09/29/1998US5815569 Method for controlling power losses associated with line interface circuits in telecommunications networks
09/24/1998WO1998042154A2 System for alerting portable communication device user of incoming call
09/24/1998DE19709888C1 ISDN terminal with integrated analogue 'a' and 'b' telephone lines terminal adaptor
09/24/1998CA2282568A1 System for alerting portable communication device user of incoming call
09/23/1998EP0866592A2 Personal communication device and call process status signalling method
09/23/1998EP0865702A2 Method of detecting operating states of an electrical apparatus and electrical apparatus for detecting apparatus-specific operating states
09/22/1998US5812658 Method and circuit for failsafe switch-hook detection during fault in a telephone system
09/22/1998US5812648 For coupling to a telephone line
09/22/1998US5812645 Telephone system and telecommunication method and apparatus automatically forming directory and indicating message and battery status
09/16/1998EP0865186A2 Telephone set
09/16/1998EP0864221A1 Method and apparatus for generating a ringing signal
09/15/1998US5809137 Telephone liner connector
09/15/1998US5809134 Telephone interface circuit with impedance termination during call pauses
09/15/1998US5809131 Ringer circuit for generating sine wave
09/15/1998US5806948 Retrofittable battery cabinet for telecommunications enclosures
09/15/1998CA2097449C Telephone line power utility circuit
09/11/1998WO1998033308A3 Validation-checking device for public telephones
09/11/1998WO1998032308A3 Subscriber line interface circuit (SLIC) simulator
09/09/1998EP0863654A2 Terminal equipment for telecommunications
09/09/1998EP0863652A2 Method and apparatus for providing an alternate telecommunications network
09/09/1998EP0862782A1 Switch with inductor function
09/08/1998US5805998 Cordless telephone apparatus
09/03/1998WO1998038778A2 Arrangement in which a useful signal is transmitted between at least two device units
09/02/1998CN1192311A Power supply for telecommunications devices
09/01/1998US5802167 Hands-free device for use with a cellular telephone in a car to permit hands-free operation of the cellular telephone
09/01/1998US5801520 Supply voltage switching apparatus
08/1998
08/19/1998EP0858705A1 Electronic impedance supply circuit
08/19/1998CN1191051A Telephone exchanger
08/19/1998CN1190857A No pluging wire telephone equipment capable of recharging in any position
08/18/1998US5796279 DC application circuit with suppressed DC magnetization
08/13/1998WO1998035484A2 A telecommunication circuit and a telecommunication device
08/13/1998WO1998028904A3 Method and device for remote feeding several consumers of the same type from one energy source
08/13/1998WO1998021914A3 Power supply system for a load, and use
08/11/1998US5792279 Equipment adapted to use solar cell or device adapted to the equipment
08/11/1998CA2140535C Electronic device having internal charge regulator for controlling application of a charging current thereto and associated method therefor
08/11/1998CA2065474C Automatic loss control circuit for digital loop transmission system
08/06/1998WO1998034387A2 Telephone call receiver indicator
08/05/1998EP0856984A1 Constant current feeding circuit and related telephonic apparatus
08/04/1998US5790656 Data access arrangement with telephone interface
08/04/1998US5790654 Digitally controlled ring signal generator
08/04/1998CA2097448C Signal separation circuit
07/1998
07/30/1998WO1998033308A2 Validation-checking device for public telephones
07/28/1998US5787365 Apparatus for combining cellular telephone ring signals and PSTN ring signals
07/28/1998US5787168 Mobile telephone fastening with vibration function
07/28/1998US5786106 Battery pack with interchangeable tag-along supplemental feature cartridge particularly for cellular telephones
07/23/1998WO1998032308A2 Subscriber line interface circuit (slic) simulator
07/23/1998WO1998026573A3 Method and device for detecting a ringtrip
07/23/1998WO1998026572A3 Ring-trip circuit
07/23/1998WO1998019480A3 Method and apparatus for downloading tones to mobile terminals
07/21/1998US5784001 Method and apparatus for presenting graphic messages in a data communication receiver
07/09/1998WO1998030005A1 Anonymous caller's distinctive alerting
07/09/1998WO1998030003A1 Unbalanced ringing using a balanced ringing generator of a subscriber line interface circuit
07/08/1998CN1187093A Tone generator for electronic exchanger
07/07/1998US5777463 Device for auto-adapting to the impedance of a supply line
07/07/1998CA2155999C Telephone battery feed circuit including noise reduction circuit
07/02/1998WO1998028904A2 Method and device for remote feeding several consumers of the same type from one energy source
07/02/1998DE19710348C1 Accessory connection unit for analogue telephone handset
07/01/1998EP0851649A2 Programming of a telephone's ringing tone
07/01/1998EP0851647A2 Cellular mobile telephone apparatus and method for transmitting a response message to an incoming call
06/1998
06/25/1998WO1998027710A1 Dual use speaker for both voice communication and signalling
06/25/1998WO1998027709A1 Incoming call alerting method for a radio communication apparatus connected to an external apparatus
06/25/1998DE19654104A1 Energy converter for storage of mechanical energy
06/24/1998CN1185695A High-voltage test circuit, ringing signal test circuit and non-ringing receiving test circuit
06/18/1998WO1998026573A2 Method and device for detecting a ringtrip
06/18/1998WO1998026572A2 Ring-trip circuit
06/18/1998WO1998013999A3 Power supply circuit, telecommunication device and method for multiple dc slope power management
06/18/1998WO1998013978A3 Current distribution circuit having an additional parallel Dc-current sinking branch
06/18/1998WO1998013744A3 Method and arrangement for controlling functions in a programme-controlled circuit in the event of operating voltage failure
06/18/1998CA2274525A1 Method and device for detecting a ringtrip
06/18/1998CA2273957A1 Ring-trip circuit
06/16/1998US5768368 Ringing voltage generator functioning to provide a ringing voltage
06/16/1998US5767787 Reduced size radio selective call receiver with a tactile alert capability by sub-audible sound
06/16/1998US5767778 Event sensing circuit and alert generator
06/16/1998CA2085415C Amplifier biasing circuit
06/11/1998WO1998025397A1 Telecommunication device and a method for providing ringing information
06/11/1998WO1998025391A1 Distinctive ringing and distinctive call-waiting tones in an isdn
06/10/1998EP0847172A1 Cordless and in all positions rechargeable telephone
06/10/1998CN1184583A Communication method for mobile terminals, incoming call receive control system for mobile terminals, and incoming call notification apparatus
06/09/1998US5764755 Ring-signal generation in a SLIC
06/09/1998US5764751 Portable telephone set with a vibrator having an automatic switching function
06/09/1998US5764734 Method for saving power in a cable system
06/09/1998US5764730 Radiotelephone having a plurality of subscriber identities and method for operating the same
06/04/1998DE19648991A1 Switching unit for mobile telephone
06/04/1998DE19648003A1 Signalanzeigesystem Signal display system
06/03/1998EP0845920A2 Electro-mechanical and acoustic transducer for portable terminal unit
05/1998
05/27/1998EP0844770A2 High voltage detection circuit, bell signal detection circuit and non-ringing call reception detection circuit
05/22/1998WO1998021914A2 Power supply system for a load, and use
05/22/1998WO1998021876A1 Power diverting device
05/22/1998WO1998021875A1 A subscriber line interface circuit
05/22/1998CA2271109A1 A subscriber line interface circuit
05/22/1998CA2271033A1 Power diverting device
05/19/1998US5754644 Method for customizing operation of a battery feed circuit in a telecommunications network
05/14/1998WO1998015110A3 Remote supply circuitry
05/14/1998DE19646626A1 Anordnung zur Stromversorgung einer Last sowie Verwendung Arrangement for supplying power to a load and use
05/14/1998DE19638116A1 Telecommunications network subscriber station operating method
1 ... 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 ... 75