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)
11/1999
11/23/1999US5991604 Ring detecting circuit and method for wireless/wired composite telephone
11/18/1999WO1999059313A1 Bag having function of notifying user that portable phone has received call and shoulder strap for bag
11/17/1999EP0957626A2 Battery switching subscriber loop interface circuit
11/17/1999EP0957619A1 Environment sensitive notification means for portable terminal
11/17/1999EP0788708B1 Low loss telephone circuit
11/17/1999EP0776565A4 Improved communications marketing system
11/17/1999CN1235731A Subscriber line interface circuit
11/16/1999US5987120 Device for identifying line reversal/ringing signal of a telephone set
11/11/1999DE19819912A1 Polarity switching device for network termination for telecommunications network
11/10/1999CN1234677A Telephone set having call-in operation limiting function and method for limiting call-in operation of telephone set
11/09/1999US5982598 Protective circuit for a grounded power plant
11/04/1999WO1999056448A1 Wrist mobile phone
11/03/1999EP0954150A2 Image communication apparatus and storage medium
11/03/1999EP0953251A2 Method and device for detecting a ringtrip
11/03/1999EP0740880B1 A method for off-hook detection during ringing and a subscriber line interface circuit for off-hook detection during ringing
11/03/1999CN1234129A Method for crediting or recrediting data card with a given amount
11/03/1999CN1233901A Mobile telephone set
11/02/1999US5978471 Method and device for detecting a ringtrip
11/02/1999US5978451 Telecommunications functions management system providing selective alerting based on caller selected option
10/1999
10/28/1999WO1999055102A1 Method and system for providing cellular communications services
10/27/1999EP0952722A1 Line power arrangement for a telephone
10/21/1999DE19801566A1 Operating blocking and releasing of mobile telephones enables mobile telephone operation to be blocked in a room and/or for a period
10/20/1999EP0824788B1 Isolating circuit for telephone apparatus
10/20/1999CN1232337A Cordless telephone with corded operability
10/19/1999US5970139 T1 channel bank control process and apparatus
10/14/1999WO1999052268A1 Dsl modem
10/14/1999CA2290654A1 Dsl modem
10/13/1999CN1231737A Method and arrangement for controlling functions in a programme-controlled circuit in the event of operating voltage failure
10/12/1999US5966655 Automatic determination of audio or vibration alerting for an incoming call in a wireless handset
10/06/1999EP0947090A2 Method and device for remote feeding several consumers of the same type from one energy source
10/06/1999EP0947084A1 Dual use speaker for both voice communication and signalling
10/06/1999CN1230861A Portable radio information terminal message-notifiation method, recording medium and microcomputer
10/06/1999CN1230833A Multi-media information communication system
10/05/1999US5963877 Telephone call receiver indicator
09/1999
09/30/1999DE19810830C1 Redundanzstrukturadaptive Stromzuführung für Kommunikationsbaugruppen Redundancy structure Adaptive Power supply for communication modules
09/29/1999EP0944995A2 Ring-trip circuit
09/29/1999CN1230070A Portable cellular phone
09/28/1999US5960367 Incoming calling system
09/28/1999US5960358 Telephone system providing a talking operation after main power supply failure
09/28/1999US5960076 Method and apparatus for determining the deviation of longitudinal signal components from a predetermined value
09/28/1999US5960075 Switchmode power converters for telephone subscriber line interface circuits
09/28/1999CA2190049C Vending machine for charging a secondary battery of a mobile phone
09/28/1999CA2171363C Telephone with user recorded ringing signal
09/23/1999WO1999038308A3 Method for compensating current variables of a subscriber circuit which have been modified by disturbance variables
09/22/1999EP0944232A2 Customer premises equipment with reduced power consumption
09/22/1999EP0944219A2 Telescopic telephone
09/22/1999CN1229556A Circuit for controlling AC/DC power load
09/21/1999US5956626 Wireless communication device having an electromagnetic wave proximity sensor
09/21/1999US5956323 Power conservation for pots and modulated data transmission
09/15/1999EP0942509A2 Redundancy structure adaptive power supply for communication units
09/14/1999US5953408 Telephone including an electromechanical transducer, method of adapting the frequency response of such a transducer and method of coding a melody
09/14/1999US5953407 In an integrated services digital network for identifying non-voice calls
09/14/1999US5953194 Arrangement for protecting telecommunications equipment from voltage transients
09/08/1999EP0941008A2 Distinctive ringing
09/07/1999CA2183344C Method and system for controlling access to a channel
09/07/1999CA2159766C Radiotelephone having a plurality of subscriber identities and method for operating the same
09/02/1999WO1999044344A2 Telephone in-use indicator system
09/02/1999WO1999029098A3 Subscriber line interface circuit
09/02/1999DE19808528A1 Energy supply unit e.g. for radio base station
09/02/1999DE19807227A1 Current supply arrangement for a mobile telephone made of one or more IC cards
09/01/1999EP0938806A2 Power supply system for a load, and use
08/1999
08/31/1999US5946637 Base station with detachable charger for cordless phone systems
08/31/1999US5946636 Quick-recognition visual notification system for use in radiotelephones
08/26/1999WO1999043093A1 2-way radio with silent annunciation
08/26/1999WO1999027704A3 Subscriber line interface circuit
08/26/1999WO1999027703A3 Subscriber line interface circuit
08/26/1999DE19806508A1 Hand-held mobile video telephone for audio or combined audio and visual communications
08/24/1999US5943420 Power-up system for line-powered telephones
08/24/1999US5943419 Subscriber circuit with built-in polarity switching circuit
08/24/1999US5943418 Ring-trip circuit
08/19/1999WO1999041826A1 Pwm controller for use with open loop dc to ac converter
08/19/1999CA2320161A1 Pwm controller for use with open loop dc to ac converter
08/18/1999EP0936798A1 Facsimile with back-up powering of line engagement means
08/17/1999US5940775 Method of and apparatus for selectively generating incoming ring in digital cordless telephone
08/17/1999US5940501 For generating a ringer signal to control a ringer in a telephone
08/17/1999US5940500 Series equipment with DC line hold transfer
08/17/1999US5940498 Electronic voice circuit configuration
08/12/1999DE19802826A1 Verfahren zum Abgleich von um Störgrößen verfälschte Stromwerte eines Teilnehmersatzes Method for reconciling corrupted by interference current values ​​of a subscriber line
08/11/1999EP0935377A2 Cordless telephone with corded operability
08/11/1999EP0934646A1 Power diverting device
08/11/1999EP0934557A2 A circuit for controlling ac/dc power load
08/11/1999EP0593556B1 Telephone marketing system
08/11/1999CN1044656C Circuit for applying direct current to winding
08/10/1999US5937061 Power saving control apparatus for simple electronic exchange system
08/04/1999EP0933917A1 Cellular phone with voice-programmed ringing melody
08/04/1999CN1225215A An arrangement for controlling subscriber interface circuits
07/1999
07/29/1999WO1999038308A2 Method for compensating current variables of a subscriber circuit which have been modified by disturbance variables
07/29/1999CA2318832A1 Method for adjusting current levels, which have been corrupted by disturbance variables, in a subscriber line circuit
07/28/1999EP0931412A1 A subscriber line interface circuit
07/28/1999CN1224558A Arrangement in which useful signal is transmitted between at least two device units
07/27/1999US5930724 Portable telephone
07/27/1999US5930351 Remote telephone ringer controller
07/27/1999US5928809 Battery holder for a mobile telephone
07/22/1999WO1999037076A1 System and method for automatic pbx detection
07/21/1999EP0930720A2 Mobile telephone and method of operation for the same
07/21/1999EP0929968A1 Digital direct current feed control for a communication system
07/21/1999EP0929967A2 Remote supply circuitry
07/21/1999EP0719439B1 Voice activity detector
07/21/1999CN1223766A Improvements in or relating to call handling
07/20/1999US5926537 Generating a distinctive ring tone for a calling party subscriber within a telecommunications network
1 ... 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 ... 75