| Patents for H04M 19 - Current supply arrangements for telephone systems (7,475) |
|---|
| 02/20/1996 | US5493611 User configurable telephone with alarm feature |
| 02/20/1996 | CA2040327C Isdn (intergrated services digital network) interface circuit and system using the same |
| 02/13/1996 | US5491746 Unique ringing on a prime telephone |
| 02/13/1996 | CA2067884C Subscriber apparatus |
| 02/08/1996 | WO1996003811A1 Power consumption control method and apparatus for a communication system subscriber unit |
| 02/08/1996 | DE19526610A1 Call signal recognition appts. for modem activation |
| 02/07/1996 | EP0696122A2 Fault current protection device for an auxiliary apparatus in digital telephone installation |
| 02/07/1996 | CN1030951C Current limited subscriber interface circuit |
| 02/06/1996 | US5490054 Ringing generator and method for converting DC to AC having continuously adjustable amplitude |
| 02/01/1996 | WO1996002999A1 Recordable voice/sound ringer for telephone |
| 01/31/1996 | CN1116019A Direct-current impressing circuit |
| 01/30/1996 | CA2134787C Digital controlled ringer signal generation |
| 01/24/1996 | EP0693850A1 Independent telephone power supply |
| 01/24/1996 | EP0693846A2 Telephone subscriber line interface circuit and method |
| 01/24/1996 | EP0693238A1 A home and small business phone system for operation on a single internal twisted pair line |
| 01/18/1996 | DE4425824A1 Fully electronic, one-pole switch for DC or AC voltages |
| 01/16/1996 | US5485516 Line termination for a telephone line |
| 01/16/1996 | CA2063205C Key telephone system |
| 01/16/1996 | CA2062526C Subscriber line interface circuit for serving isdn subscribers using echo cancellers and pots subscribers |
| 01/10/1996 | EP0691752A1 Transformerless hybrid circuit having direct powered line-side amplifiers |
| 01/09/1996 | US5483592 Ringer unit driving system in a subscriber transmission system |
| 01/09/1996 | US5483574 Communication terminal equipment |
| 01/04/1996 | WO1996000429A1 Paging receiver with distinctive alert patterns |
| 01/04/1996 | DE4423790A1 Operating installation for additional powered function via telephone exchange line |
| 01/04/1996 | DE19522769A1 Device for transmitting information to an interested party |
| 01/03/1996 | EP0690563A2 Output circuit having at least one external transistor |
| 01/02/1996 | US5481599 Automated audio output device for a telephone set |
| 12/27/1995 | CN1114094A Low internal feed equipment for subscriber's interface |
| 12/26/1995 | US5479476 Mobile telephone having groups of user adjustable operating characteristics for facilitating adjustment of several operating characteristics |
| 12/26/1995 | US5479056 Power source device |
| 12/26/1995 | CA2077522C Battery feed circuit for supplying feed current to telephone set |
| 12/20/1995 | EP0688125A1 Mobile phone with vibrating alarm |
| 12/20/1995 | EP0688082A1 Portable communication apparatus preventing trouble when battery wears |
| 12/14/1995 | WO1995034123A1 Asymmetrical low frequency modulation switching inverter |
| 12/13/1995 | EP0687098A2 Telephone line sourced power supply |
| 11/23/1995 | DE4417387A1 Emergency operation procedure for speech and/or data communication appts. in digital ISDN and analog telephone network |
| 11/22/1995 | EP0683593A2 Energy saving mode in telecommunications equipment |
| 11/22/1995 | EP0630543B1 Circuit for transmitting small, low energy signals and large, essentially higher energy signals |
| 11/22/1995 | CN1030365C Telephone circuit assembly with hook-off detector circuit |
| 11/21/1995 | US5469282 Power supply system for optical network unit of a fiber in the loop |
| 11/15/1995 | CN1111885A Portable alerting unit for alerting a user to call arrival to portable radio apparatus |
| 11/14/1995 | US5467384 Method and apparatus for providing power to a coaxial cable network |
| 11/08/1995 | EP0681389A2 Telephone line interface circuit |
| 11/08/1995 | EP0681388A2 Telephone line interface circuit |
| 11/08/1995 | CN1111471A Electronic device having internal charge regulator |
| 10/26/1995 | WO1995028793A1 Power management for line powered telecommunication apparatus |
| 10/26/1995 | CA2187452A1 Power management for line powered telecommunication apparatus |
| 10/25/1995 | EP0679009A2 Switching device with feeding circuit for providing the current to a subscriber terminal |
| 10/25/1995 | CN1110886A Standby power saving in mobile phones |
| 10/24/1995 | US5461671 Telephone line power utility circuit |
| 10/24/1995 | CA2035411C Ringing circuit for use in portable telephone set |
| 10/18/1995 | CN1110494A Method and apparatus for providing power to a coaxial cable network |
| 10/17/1995 | US5459783 Acoustic feedback suppression device particulary for auxiliary ringers in plug-in telephone systems |
| 10/12/1995 | DE4420430C1 Supplying operating voltage to subscriber line connections at exchange |
| 10/11/1995 | EP0676862A1 Direct-current impressing circuit |
| 10/11/1995 | EP0569582A4 Telephone ringing signal generator |
| 10/10/1995 | US5457741 Subscriber transmission system |
| 10/10/1995 | CA1337305C High impedance signal detection device |
| 10/05/1995 | DE4409394C1 Telephone appts. call tone signal radiating system |
| 10/04/1995 | EP0675629A1 Method for faultless off-hook detection in ring signal feeding in a digital telephone exchange and circuit for the implementation of the same |
| 10/03/1995 | US5455466 Inductive coupling system for power and data transfer |
| 09/27/1995 | EP0674417A2 Call alerting auxiliary device for a portable radiotelephone |
| 09/26/1995 | US5454032 Method of establishing communication link to one of multiple devices associated with single telephone number |
| 09/26/1995 | US5454031 Dial inbound meter interface unit which derives its power from a telephone line |
| 09/21/1995 | DE4408324A1 Kompakt-Fernsprechendgerät Compact telephone terminal |
| 09/20/1995 | EP0673146A1 Method for assigning of ring signal units arranged in pairs in a multiple time division telephone exchange |
| 09/19/1995 | US5452354 Ringing tone apparatus |
| 09/14/1995 | WO1995024790A1 Compact telephone set |
| 09/13/1995 | EP0671098A1 Network termination unit |
| 09/12/1995 | US5450618 Full duplex and half duplex communication unit with volume setting |
| 09/12/1995 | US5450613 Mobile communications equipment which detects and notifies when it is moved into or out of a service area |
| 09/06/1995 | EP0670651A1 Circuit arrangement for DC-feeding of a telephone line |
| 09/05/1995 | US5448620 Volume control for a dual mode communications device |
| 08/31/1995 | DE4427207C1 Fault current protection device for digital telephone accessory |
| 08/31/1995 | DE4406500A1 Circuit for low-loss AC voltage generation |
| 08/30/1995 | EP0669750A2 Call detecting circuit in a telecommunication terminal |
| 08/29/1995 | US5446785 Telephone terminal equipment in which telephone numbers of callers are displayed |
| 08/29/1995 | CA2034094C Radio telecommunication apparatus |
| 08/24/1995 | DE19502152A1 Anzeigeschaltung für Telefonanrufe Ads for phone calls |
| 08/23/1995 | EP0668688A1 Network connecting equipment and concentrator connecting equipment in a telecommunication network |
| 08/23/1995 | EP0668685A1 Circuit arrangement for backing-up data upon a power failure for an answering device with digital voice storage in telecommunication terminals |
| 08/23/1995 | EP0668001A1 Process for programming a base station using a mobile unit. |
| 08/22/1995 | US5444777 Battery feed for telephone line cards |
| 08/17/1995 | DE4404509A1 Additional call member arrangement for telephone subscriber's appts. |
| 08/16/1995 | EP0667084A1 Information transmission system |
| 08/16/1995 | EP0667079A1 Process for charging accumulators in cordless communications equipment |
| 08/15/1995 | US5442695 Ringer circuit |
| 08/15/1995 | US5442694 Ring tone detection for a telephone system |
| 08/15/1995 | US5442692 Telecommunication system having a capability of changing the alerting tone |
| 08/10/1995 | WO1995021485A1 Power supply for private branch exchange |
| 08/10/1995 | WO1995019083A3 Interface circuit |
| 08/09/1995 | EP0593556A4 Telephone marketing system. |
| 08/08/1995 | US5440595 Communication apparatus with low power consumption |
| 08/08/1995 | US5440262 High-efficiency Ring/MWL generator |
| 08/08/1995 | US5440253 Semiconductor integrated comparator circuit |
| 08/01/1995 | CA2041209C Tone and announcement message code generator for a telephonic switching system and method |
| 07/27/1995 | WO1995020290A1 A method and an arrangement for generating a ringing signal |
| 07/27/1995 | WO1995020289A1 A method for off-hook detection during ringing and the use of a subscriber line interface circuit for off-hook detection during ringing |
| 07/27/1995 | CA2179995A1 A method for off-hook detection during ringing and the use of a subscriber line interface circuit for off-hook detection during ringing |
| 07/27/1995 | CA2179387A1 A method and an arrangement for generating a ringing signal |