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)
03/1999
03/03/1999EP0899908A1 Circuit for powering up and powering down electrical loads as required
03/02/1999US5878354 Portable telephone set usable as a paging receiver for remote notification and response to calls and messages
03/02/1999US5878133 Digital direct current feed control for a communication system
03/02/1999US5877695 Visual alarm for a communication module
02/1999
02/27/1999CA2245984A1 Power supply adapter circuit
02/23/1999US5875245 High voltage detection circuit, bell signal detection circuit and non-ringing reception detection circuit
02/23/1999CA2128631C Integrated interface circuit for driving a subscriber line
02/19/1999CA2211937A1 Mobile phone battery compartment
02/17/1999CN1208469A 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
02/16/1999US5872843 Isolating circuit for telephone apparatus
02/16/1999US5872842 Unbalanced ringing using a balanced ringing generator of a subscriber line interface circuit
02/11/1999WO1999007162A1 Power conservation for pots and modulated data transmission
02/09/1999US5870684 Radio communication apparatus with adjustable alert tone
02/09/1999US5870683 Mobile station having method and apparatus for displaying user-selectable animation sequence
02/09/1999US5870466 T1 channel bank control process and apparatus
02/04/1999WO1999005850A1 Automatic volume control for a telephone ringer
02/04/1999WO1999005538A1 Instantaneous capacity indication of a secondary element
02/04/1999WO1998049782A3 A wire bound telecommunications device and a power supply circuit
02/03/1999EP0895392A2 Telecommunication terminal
02/03/1999EP0894398A1 Method and arrangement for increasing onhook voltage
02/03/1999EP0894393A2 A telecommunication circuit and a telecommunication device
02/02/1999US5867796 Portable telephone set capable of being put in a holding mode by operation of a vibration unit which is for announcing reception of an incoming call to a user
01/1999
01/28/1999DE19709508A1 Identification method e.g. for communication apparatus
01/26/1999US5864766 Cellular telephone battery with auto-answering and hand-free functions
01/26/1999CA2144345C Cordless telephone system with different ringing patterns
01/21/1999WO1999003259A2 Method and apparatus for controlling a telephone ring signal
01/13/1999EP0890250A1 Incoming call alerting method for a radio communication apparatus connected to an external apparatus
01/12/1999CA2141322C Method and apparatus for providing power to a coaxial cable network
01/07/1999WO1999000970A2 Circuit for transmitting messages
01/06/1999CN1204435A Method of detecting operating states of electrical apparatus and electrical apparatus for detecting apparatus-specific operating states
01/05/1999US5857010 Power-failure resistant communication system
12/1998
12/30/1998EP0888032A1 Electro-mechanical-acoustic transducing arrangement
12/30/1998EP0887988A2 Foldable portable telephone set
12/30/1998EP0887985A1 Portable communication device
12/30/1998EP0709010A4 Power coupler for coupling power from a transmission line to a node thereon
12/30/1998CN1203721A Method and apparatus for generating ringing signal
12/30/1998CN1203488A Trunk interface circuit having function of battery feed to central office
12/29/1998US5854839 Dual voltage, self-monitoring line circuit
12/29/1998US5854550 For a digital communications line
12/29/1998CA2148178C Telephone line sourced power supply
12/24/1998DE19726595A1 Acoustic two-tone call signal radiation method for loud-speaker telephone
12/23/1998WO1998058301A2 A circuit for controlling an ac/dc buzzer load
12/23/1998CN1202788A Radio telephone device
12/16/1998EP0883967A2 Remote test of a wireless subscriber connection
12/10/1998WO1998056162A1 A method in a subscriber line interface circuit as well as a subscriber line interface circuit
12/10/1998WO1998056157A1 Residential protection service center
12/10/1998WO1998038778A3 Arrangement in which a useful signal is transmitted between at least two device units
12/10/1998CA2293494A1 A method in a subscriber line interface circuit as well as a subscriber line interface circuit
12/09/1998EP0883273A1 Impedance switch
12/09/1998EP0882375A2 A communication network terminal supporting a plurality of applications
12/09/1998EP0882351A1 Distinctive ringing and distinctive call-waiting tones in an isdn
12/08/1998US5848362 Portable alerting unit for alerting a user to call arrival to portable radio apparatus
12/08/1998US5848149 Subscriber line interface and power circuit
12/08/1998US5848148 Communication apparatus
12/08/1998US5848147 Terminal for wirebound telecommunication
12/08/1998CA2078389C Telephone line message waiting and ring indicator
12/03/1998WO1998042154A3 System for alerting portable communication device user of incoming call
12/02/1998EP0880847A1 Telecommunication device and a method for providing ringing information
12/02/1998EP0880844A2 Current distribution circuit having an additional parallel dc-current sinking branch
12/02/1998CN1200639A Radio communication apparatus having plurality of communication functions
12/02/1998CN1200617A Fixed subscriber unit
12/01/1998US5845190 Cable access device and method
12/01/1998US5844983 Method and apparatus for controlling a telephone ring signal
12/01/1998CA2102837C Protection and recovery of telephone line interface circuits
11/1998
11/26/1998WO1998035484A3 A telecommunication circuit and a telecommunication device
11/26/1998WO1998034387A3 Telephone call receiver indicator
11/26/1998EP0894393A3 A telecommunication circuit and a telecommunication device
11/25/1998EP0880241A2 Mobile communications equipment
11/25/1998EP0879528A1 Telecommunications networks
11/25/1998CN1200218A Electronic impedance supply circuit
11/25/1998CN1200004A Ringing-tone control device for telephone set
11/25/1998CN1040932C Standby power saving in mobile phones
11/24/1998US5841853 Telephone apparatus with interrupt call processing capability
11/17/1998US5838788 Telephone ringing signal generator
11/17/1998US5838149 Voltage control means having a reduced sensitivity to temperature variations
11/11/1998EP0876726A2 Power supply circuit, telecommunication device and method for multiple dc slope power management
11/10/1998US5835863 Wireless telephone for cellular telephone system
11/05/1998WO1998049827A1 Mobile radiotelephone method and system and terminal used in such a system
11/05/1998WO1998049822A1 Generating a distinctive ring tone for a calling party subscriber within a telecommunications network
11/05/1998WO1998049782A2 A wire bound telecommunications device and a power supply circuit
11/04/1998EP0876071A1 Automatic determination of audio or vibration alerting for an incoming call in a wireless handset
11/04/1998EP0876070A1 Method of controlling wireless unit operations depending on their geographical location
11/04/1998EP0876040A1 Automatic volume adjustment in a wireless handset
11/04/1998CN1198071A Electro-machanical and acoustic transducer for prtable teminal unit
11/04/1998CN1198070A Radiotelephone and method for clock calibration for slotted paging mode in CDMA radiotelephone system
11/04/1998CN1198069A Response message transmitter in celluar mobile telephone apparatus
10/1998
10/30/1998CA2232579A1 Geographical determination of wireless operations
10/29/1998WO1998048541A2 Direct digital access arrangement circuitry and method for connecting to phone lines
10/27/1998US5828748 Method for customizing operation of a line interface circuit in a telecommunications network
10/27/1998US5828728 Telecommunications network
10/27/1998US5828558 PWN controller use with open loop flyback type DC to AC converter
10/21/1998EP0872118A1 Power supply for telecommunications devices
10/20/1998US5825160 Power control circuit in wireless mobile communication system
10/15/1998WO1998046003A1 Telephone equipment analog interface circuit
10/13/1998US5822702 Radio receiving terminal having common receiver circuitry for both receiving a radio signal including a call number and a remote control signal
10/07/1998EP0869655A2 Analog/digital integrated subscriber circuit
10/06/1998US5818927 Circuit for controlling an on-hook voltage by the use of a balanced amplifier without supplying a constant current to the balanced amplifier
10/06/1998US5818923 System and method for supressing pulse dialing feedback occurring particularly with auxiliary acoustic ringers in socket telephone systems
10/06/1998CA2042683C Enhanced high voltage line interface circuit
10/06/1998CA2042682C Over-current detector circuit for an enhanced subscriber line interface
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