| Patents for H04M 19 - Current supply arrangements for telephone systems (7,475) |
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| 04/20/2000 | DE19846544A1 Mobile telephone with call tone signal memory samples analogue signal for entering digital count values in memory for use as individual call tone signal upon playback via wideband loudspeaker |
| 04/19/2000 | CN1251247A System for alerting portable communication device user of incoming call |
| 04/19/2000 | CN1250990A Infrared data communication device and method |
| 04/19/2000 | CN1051665C Cordless telephone apparatus |
| 04/13/2000 | DE19947612A1 Mobile video telephone with radio and image transmission facility, has ambient light sensor |
| 04/12/2000 | EP0993169A2 Etat de réponse pour appel en attente |
| 04/12/2000 | EP0992148A1 Wrist mobile phone |
| 04/12/2000 | CN2373956Y Automatic charger for telephone set |
| 04/11/2000 | US6049700 Automatic volume adjustment in a wireless handset |
| 04/11/2000 | US6049471 Controller for pulse width modulation circuit using AC sine wave from DC input signal |
| 04/11/2000 | US6049234 Telemetering apparatus |
| 04/06/2000 | WO2000019744A1 Emergency telephone system ring suppressor apparatus and method |
| 04/06/2000 | WO2000019588A1 Method and apparatus for deriving power from a clock signal coupled through capacitors |
| 04/06/2000 | WO1999063498A3 Electric communication systems |
| 04/04/2000 | US6047195 Sound volume setting device for a portable telephone |
| 03/30/2000 | WO2000018107A2 System and method for identifying a calling party |
| 03/30/2000 | WO2000001131A9 Piezoelectric vibrational and acoustic personal communication device |
| 03/29/2000 | EP0989726A1 Telecommunications device with visual display |
| 03/29/2000 | EP0630542A4 Hybrid fiber in the loop telephony system |
| 03/28/2000 | US6044280 Arrangement in which a useful signal is transmitted between at least two device units |
| 03/28/2000 | US6044279 Portable electronic apparatus with adjustable-volume of ringing tone |
| 03/22/2000 | EP0986891A1 A method in a subscriber line interface circuit as well as a subscriber line interface circuit |
| 03/22/2000 | EP0986889A1 Residential protection service center |
| 03/21/2000 | US6041240 Clear channel selection system for a cordless telephone |
| 03/16/2000 | WO2000014971A2 Bell sound selecting method for a cellular phone using an audio response system |
| 03/15/2000 | CN1247666A Method and device for remote feeding several consumers of same type from one energy sourch |
| 03/15/2000 | CN1247662A Dual use speaker for both voice communication and signalling |
| 03/15/2000 | CN1247428A Portable telephone |
| 03/09/2000 | WO2000013428A2 Portable communication equipment with mode conversion property and mode conversion control system |
| 03/08/2000 | EP0984657A2 Programmable subscriber loop interface circuit and method |
| 03/08/2000 | EP0984612A1 Dsl modem |
| 03/08/2000 | EP0984564A1 Functionality transfer from a public telephone to a remotely connected Server |
| 03/08/2000 | EP0693238A4 A home and small business phone system for operation on a single internal twisted pair line |
| 03/07/2000 | US6035211 Dual use speaker for both voice communication and signalling |
| 03/02/2000 | DE19838655A1 Auslagerung von Funktionalität eines öffentlichen Telefons in einen vorgeschalteten Server Outsourcing of functions of a public telephone in an upstream server |
| 02/29/2000 | US6032058 Cellular mobile telephone apparatus and an alarm device therefor |
| 02/23/2000 | EP0981227A2 Power feeding system for telephone terminal in LAN |
| 02/23/2000 | CN1245611A Method and device for detecting ringtrip |
| 02/22/2000 | US6028916 Method and apparatus for maintaining availability of lifeline telephony service on a hybrid fiber-coax network |
| 02/22/2000 | US6028531 Terminal units for a mobile communications system |
| 02/16/2000 | CN2364633Y Power supply uninterrupted cable modem |
| 02/15/2000 | US6026159 Integrated ringer for short telephone lines |
| 02/15/2000 | CA2205320C Telephone line interface circuit with voltage control |
| 02/15/2000 | CA2202312C Dual voltage, self-monitoring line circuit |
| 02/15/2000 | CA2202311C Self-monitoring line interface circuit |
| 02/10/2000 | WO2000007277A1 Self-contained recharging device for portable telephone and/or battery and/or protective case |
| 02/09/2000 | EP0978194A1 Mobile radiotelephone method and system and terminal used in such a system |
| 02/09/2000 | EP0978190A2 Direct digital access arrangement circuitry and method for connecting to phone lines |
| 02/08/2000 | CA2162804C Portable multi-information communication device |
| 02/01/2000 | US6020732 Flux cancelling transformer line circuit |
| 02/01/2000 | US6020728 Control circuit with a single control input for controlling DC and AC currents in a load |
| 02/01/2000 | US6020727 Setting of a linear regulator to stand-by |
| 02/01/2000 | CA2175861C Power control method and apparatus suitable for use in a radio communication device |
| 02/01/2000 | CA2172563C Subscriber line interface and power circuit |
| 01/27/2000 | DE19833385A1 Arrangement for detecting and indicating incoming telephone calls is connected to telephone line, signals visually and/or audibly when telephone rings until telephone lifted or button pressed |
| 01/26/2000 | EP0975137A2 Network control apparatus capable of decreasing power consumption during a waiting mode |
| 01/26/2000 | EP0974222A1 Telephone equipment analog interface circuit |
| 01/25/2000 | US6018671 Silent call accept |
| 01/25/2000 | US6018654 Method and apparatus for downloading tones to mobile terminals |
| 01/25/2000 | US6018452 Residential protection service center |
| 01/18/2000 | US6016312 Radiotelephone and method for clock calibration for slotted paging mode in a CDMA radiotelephone system |
| 01/18/2000 | CA2127269C Aural annunciator circuit for a receiver |
| 01/11/2000 | US6014574 Circuit configuration for voltage polarity reversal in a mobile radio transceiver |
| 01/11/2000 | US6014573 Function for facilitating use of a double-acting communication device and a double-acting communication device |
| 01/11/2000 | CA2180316C Standby high voltage analog line feed |
| 01/06/2000 | WO2000001131A2 Piezoelectric vibrational and acoustic personal communication device |
| 01/06/2000 | WO2000000299A1 Electrical/mechanical/sound converter and apparatus of electrical/mechanical/sound conversion |
| 01/05/2000 | EP0968599A2 System for alerting portable communication device user of incoming call |
| 01/05/2000 | DE19829933A1 Visual signal systems for mobile telephones |
| 01/04/2000 | US6011384 Voltage balancing device for a direct current power supplying system |
| 01/02/2000 | CA2242664A1 Ac/dc rechargeable mobil phone cell |
| 12/29/1999 | EP0967511A1 Display device with solar cells |
| 12/29/1999 | EP0667079B1 Process for charging accumulators in cordless communications equipment |
| 12/28/1999 | US6009167 Double-bell ringing system of a telephone |
| 12/28/1999 | US6008681 Method and apparatus for deriving power from a clock signal coupled through a transformer |
| 12/23/1999 | WO1999066704A1 Daa circuitry and method for connecting phone lines having a dc holding |
| 12/23/1999 | DE19721277A1 Call encoder arrangement for enabling telephone calls to be made without charges |
| 12/21/1999 | US6006114 Radiotelephone enabling adjustment of alerting indicator volume/level during incoming calls |
| 12/21/1999 | US6005933 Method for communication with no power feed and exchange for realizing the method |
| 12/16/1999 | WO1999065221A1 A telecommunication device with acoustically programmable ringtone generating means and a method for the programming thereof |
| 12/16/1999 | DE19826369A1 Subscriber connecting circuit for telephone installation |
| 12/15/1999 | EP0963629A1 Method and apparatus for maintaining availability of lifeline telephony service on a hybrid fiber-coax network |
| 12/15/1999 | EP0752182A4 Method and system for controlling access to a channel |
| 12/14/1999 | US6002763 Telephone with a mute ringer function having an automatic ringer reactivation capability |
| 12/14/1999 | US6002761 Multi-line programmable telephone call annunciator |
| 12/09/1999 | WO1999063746A1 Method and apparatus for deriving power from a clock signal coupled through a transformer |
| 12/09/1999 | WO1999063745A1 Method and arrangement for choosing supply voltage |
| 12/09/1999 | WO1999063498A2 Electric communication systems |
| 12/09/1999 | CA2334006A1 Method and arrangement for choosing supply voltage |
| 12/08/1999 | EP0963098A2 Polarity switching and network termination unit in a telecommunication network |
| 12/08/1999 | EP0963088A1 Method and system for transmitting information through a telephone network |
| 12/07/1999 | US5999612 Integrated telephony and data services over cable networks |
| 12/07/1999 | US5999593 System and method for automatic PBX detection |
| 12/07/1999 | US5999426 Circuitry for voltage pole reversal |
| 12/07/1999 | US5999094 Combination telephone and smoke alarm system |
| 12/01/1999 | EP0961470A1 Dual-slope current battery-feed circuit |
| 11/30/1999 | US5995852 Communication terminal equipment and call incoming control method |
| 11/25/1999 | DE19822370A1 Telekommunikationsendgerät Telecommunications terminal |
| 11/24/1999 | EP0959608A1 Telecommunication equipment with adaptation of ringing tone to the ambient noise |
| 11/24/1999 | CN1236520A Power diverting device |