| Patents for H04M 1 - Substation equipment, e.g. for use by subscribers (168,223) |
|---|
| 04/01/1987 | EP0216488A2 Digital signal processor |
| 04/01/1987 | EP0216096A2 Device for cutting off an involontary connection at a telephone apparatus by the exchange in a system with two automatically alternatively connectable parties on a line |
| 04/01/1987 | EP0216013A2 Relay for switching into a subscriber circuit of a telephone exchange |
| 03/31/1987 | US4654488 Push and rocker action switch |
| 03/31/1987 | US4654485 Single frequency remote control of telephone answering device accomplishes several functions dependent on the present state of the device |
| 03/31/1987 | US4654481 Security system for cordless extension telephones |
| 03/31/1987 | CA1219984A1 Tone signalling adapter for a telephone set |
| 03/31/1987 | CA1219983A1 Pushbutton switch assembly with integrated lock-down switch |
| 03/31/1987 | CA1219982A1 Telephone circuit comprising a class-b amplifier |
| 03/31/1987 | CA1219981A1 Telephone systems |
| 03/26/1987 | DE3532646A1 Fixing device for a potentiometer on a printed circuit board in a telephone set |
| 03/24/1987 | US4653115 Transmitter battery case |
| 03/24/1987 | US4653094 Telephone set line status display |
| 03/24/1987 | US4653090 Terminal for use with a communication system |
| 03/24/1987 | US4653089 Personal telephone adapter |
| 03/24/1987 | US4653087 Stereo interface telephone ring detector |
| 03/24/1987 | US4653086 Communication terminal for processing voice and graphical information |
| 03/24/1987 | US4652980 Music and lights Christmas ball ornament |
| 03/24/1987 | US4652699 Voice scrambler using frequency-inversion and band-splitting technique |
| 03/18/1987 | EP0214810A2 Radio telephone system control apparatus |
| 03/18/1987 | EP0214809A2 Radio telephone system control apparatus and method |
| 03/18/1987 | EP0214472A2 Control circuit for use with electronic attenuators and method for providing a control signal proportional to absolute temperature |
| 03/18/1987 | EP0214170A1 Telephone installation with short range radio transmissions comprising sets each simultaneously usable by a plurality of persons |
| 03/18/1987 | EP0084562B1 Multi-tone signal generator |
| 03/18/1987 | CN86105137A Connector circuit for user's wire |
| 03/17/1987 | US4650931 Cordless telephone |
| 03/17/1987 | US4650928 Signal transmitting and/or receiving apparatus |
| 03/17/1987 | US4650927 Processor-assisted communication system using tone-generating telephones |
| 03/17/1987 | US4650269 Modular plug connector |
| 03/12/1987 | WO1987001546A1 Hands-free control system for a radiotelephone |
| 03/12/1987 | WO1987001539A1 Optical fiber bandwidth limiting method |
| 03/12/1987 | DE3531170A1 Circuit for connecting two primary or secondary connection lines and the telephone sets assigned to them |
| 03/11/1987 | EP0213929A2 Radio telephone system control apparatus and method |
| 03/11/1987 | EP0213903A2 An automatic telephone answering system |
| 03/11/1987 | EP0213874A2 Corrosion protection apparatus |
| 03/11/1987 | EP0213679A1 Telephone set with a receiving amplifier provided with an anti-Larsen arrangement |
| 03/11/1987 | EP0213459A2 Circuit arrangement for a telephone apparatus |
| 03/10/1987 | US4649562 Drive mechanism for a two-tape telephone answering machine using a single reversible motor |
| 03/10/1987 | US4649235 Telephone circuit with a class-B amplifier output stage |
| 03/10/1987 | CA1219096A1 Integral transmitter and modular jack assembly for a telephone set |
| 03/05/1987 | DE3531556A1 Circuit arrangement for a telephone set with a digital clock |
| 03/05/1987 | DE3531335A1 Housing of an operating part for a carphone |
| 03/05/1987 | DE3530856A1 Circuit arrangement for audible operating help in telecommunications terminals, in particular telephone terminals |
| 03/05/1987 | DE3530261A1 Telephone connection device |
| 03/04/1987 | EP0212947A2 Automatic personnel monitoring system |
| 03/04/1987 | CN86200958U Bass of standard module for telephone installations |
| 03/03/1987 | US4648125 Portable radio transceiver |
| 03/03/1987 | US4648112 Desk/wall mounted telephone subset |
| 03/03/1987 | US4648110 Circuit arrangement for a voice-controlled hands-free telephone facility |
| 03/03/1987 | US4648109 Light emitting diode message waiting lamp circuit |
| 03/03/1987 | US4647729 Circuit board with contact positions, as used for telecommunications terminals and other apparatus |
| 03/03/1987 | US4647728 Programming switch assembly for communication terminals |
| 03/03/1987 | US4647725 Indoor type telephone network interface device |
| 03/03/1987 | US4647723 Circuit for detection of off-hook condition of extension telephones |
| 03/03/1987 | US4647722 Land mobile telephone system |
| 03/03/1987 | US4646987 Take-up reel for tape containing conductors |
| 02/26/1987 | WO1987001256A1 Telephone and demodulator |
| 02/26/1987 | EP0116625A4 Multiple simultaneous tone decoder. |
| 02/26/1987 | DE3634846A1 Device for carrying out direct telephone calls |
| 02/26/1987 | DE3529652A1 Switching device for telephones |
| 02/25/1987 | CN86200082U Portable automatic telephone detector |
| 02/25/1987 | CN85105956A Method and apparatus of establishing the relative match code between base device and moving device |
| 02/24/1987 | US4646344 Mobile radio set |
| 02/24/1987 | US4645882 Latching relay drive circuit for use in telephone sets |
| 02/24/1987 | US4645875 Telephone answering programming devices |
| 02/18/1987 | CN85103507A Active noise reducing microphone |
| 02/17/1987 | US4644579 Shunt regulator for hands-free telephone |
| 02/17/1987 | US4644107 Voice-controlled telephone using visual display |
| 02/17/1987 | US4644106 Apparatus for timely controlling the sound characteristic of a signaling means of a voice communication device |
| 02/17/1987 | CA1218171A1 Personal-calling communication system |
| 02/12/1987 | WO1987000995A1 An intermediate amplifier for use in two-wire connections of a dial telephone network and a method for the gain control of said amplifier |
| 02/12/1987 | DE3527262A1 Circuit arrangement for the feed voltage supply of a telephone station |
| 02/10/1987 | CA1217888A Subscriber's telephone hold circuit with automatic disconnect |
| 02/10/1987 | CA1217886A Electro-optic indicating device |
| 02/10/1987 | CA1217849A1 Programming switch assembly for communicating terminals |
| 02/10/1987 | CA1217819A Apparatus and method for generating multi-digit codes |
| 02/04/1987 | EP0210797A2 Digital Subscriber controller |
| 02/04/1987 | CN85101800A Transmitter assembly for a telephone handset |
| 02/03/1987 | US4641339 Variable bandwidth handsfree telephone using switched capacitor filtering |
| 02/03/1987 | US4640993 Telephone subscribers' circuits |
| 02/03/1987 | US4640990 Telephone answering apparatus having two integrators of different time constants |
| 02/03/1987 | US4640988 Telephone interrupter |
| 02/03/1987 | US4640987 Cordless telephone |
| 02/03/1987 | CA1272278B Calling line tracing system and identification detector |
| 02/03/1987 | CA1217550A1 Calling line tracing system and identification detector |
| 01/31/1987 | CN85102113A Audio frequency transmission circuit formed by line-voltage stabilizer type transmitting amplifier |
| 01/31/1987 | CN85102105A Telephone circuit with class b amplifier |
| 01/31/1987 | CN85101395A Wideband high voltage amplifier for telephone exchange subscriber line interface utilizing low voltage control circuitry |
| 01/29/1987 | WO1987000718A1 Mobile telephone system |
| 01/29/1987 | WO1987000717A1 A telephone line switch |
| 01/28/1987 | EP0209893A2 Memory device |
| 01/28/1987 | EP0209716A2 Circuit for the suppression of perturbing signals on the reception branch line of a subscriber line circuit realized by electronic components without the use of a voice transformer |
| 01/28/1987 | EP0209687A2 Telephone answering device |
| 01/27/1987 | US4639554 Dual-tone multiple-frequency-signal generating apparatus |
| 01/27/1987 | US4639553 Call signal detecting device |
| 01/27/1987 | US4639552 Apparatus for converting a standard telephone to an unlisted number telephone |
| 01/27/1987 | US4639551 Regulated power supply circuit particularly for telephone set |
| 01/27/1987 | US4639550 Cordless telephone |
| 01/27/1987 | US4639549 Cordless telephone |
| 01/27/1987 | CA1217287A1 Process and a device for franking mail |