Patents
Sitemap › H04 - Electric communication technique › H04M - Telephonic communication › H04M 1 - Substation equipment, e.g. for use by subscribers
Patents for H04M 1 - Substation equipment, e.g. for use by subscribers (168,223)
11/1983
11/08/1983US4414432 Pseudo-full duplex television/telephone loudspeaker system
11/02/1983EP0093036A2 Telephone circuitry
11/02/1983EP0093022A1 Apparatus for generating a plurality of electric signals
11/01/1983US4413159 Dial pulsing circuit
11/01/1983US4413158 Automatic call forwarding telephone apparatus
10/1983
10/26/1983EP0092084A2 Telephone device with an integrated electronic message transmitter
10/25/1983US4412353 Mixing circuit
10/25/1983US4412099 Sound synthesizing apparatus
10/25/1983US4411485 Wall plate kit for telephones
10/25/1983US4411482 Telephone organizer
10/19/1983EP0091630A1 Device for engaging the line without lifting the hook of a telephone set comprising a microprocessor
10/19/1983EP0091513A2 Loudspeaker telephone apparatus
10/18/1983US4410771 Telephone handset receptacle for off-hook placement
10/18/1983US4410759 Electronics package
10/13/1983WO1983003508A1 Dial pulsing circuit
10/11/1983US4409440 Telephone index and switch arrangement
10/04/1983US4408101 Automatic telephone dialing apparatus with magnetic switch assembly
10/04/1983CA1154889A1 Line hold circuits
09/1983
09/27/1983US4406928 Multi-purpose telephone holder apparatus
09/27/1983US4406926 Telephone station circuit using digital tone generation
09/20/1983US4405839 Timed telephone ring silencer device
09/20/1983US4405833 Telephone call progress tone and answer identification circuit
09/20/1983CA1154186A1 Speech networks for telephone sets
09/20/1983CA1154184A1 Circuits and methods for initializing the loop current of a telephone set
09/20/1983CA1154183A1 On-hook/off-hook status check circuit
09/15/1983WO1983003177A1 Gain regulation circuit
09/15/1983WO1983003176A1 Waveform clipping circuits
09/13/1983US4404435 Telephone lock
09/07/1983EP0087908A1 Electro-acoustic calling devices
09/06/1983US4403116 Telephone apparatus
09/01/1983WO1983003037A1 Light receiver of the state of a telephone call and signal transmitter appropriate to this use
08/1983
08/30/1983US4401861 Semiconductor crosspoint linearizing arrangement
08/30/1983CA1153139A1 Pushbutton switch assemblies for telephone sets
08/23/1983US4400591 Simulated space helmet
08/23/1983US4400589 Subscriber station network
08/23/1983US4400588 Electronic voice network for a telephone subscriber's substation
08/23/1983US4400586 Remote message repeat control for telephone answering system
08/23/1983US4400585 Method and apparatus for automatically attempting to seize a radio channel in a multichannel communication system
08/23/1983CA1152579A1 Device for controlling a digital signal generator
08/16/1983US4399331 Telephone microprocessor system
08/16/1983CA1152242A1 Active speech network circuit for a telephone set
08/16/1983CA1152205A1 Telephone transmitter including an electret transducer
08/10/1983EP0085482A1 Input/output device arrangements for terminals
08/09/1983US4398147 Methods of testing multifrequency dialing signals
08/09/1983US4398067 Locking device for telephone instrument
08/09/1983US4398062 Apparatus for privacy transmission in system having bandwidth constraint
08/03/1983EP0084562A1 Multi-tone signal generator.
08/02/1983US4396891 Gain control circuit
08/02/1983US4396810 Pushbutton telephone dial locks
08/02/1983US4396804 Telephone answering device with automatic rewind
08/02/1983US4396803 Coplanar type driving mechanism for telephone answering and recording device
08/02/1983US4396799 Combination of a loudspeaking telephone set and a hand set for soft speaking
08/02/1983CA1151332A1 Multi-purpose telephone of micro-process
08/02/1983CA1151243A1 Optical telephone device
07/1983
07/26/1983US4395591 Arrangement for supporting a telephone handset or the like
07/26/1983CA1150868A1 Electronic telephone circuit
07/26/1983CA1150817A1 Hands free telephone receiver holding device
07/26/1983CA1150581A1 Telephone attachment
07/21/1983WO1983002514A1 Telephone hook switch
07/19/1983US4394743 Tone generation method and apparatus using stored reference calibration coefficients
07/19/1983US4394545 Construction of a telephone instrument
07/19/1983US4394542 Telephone transmission circuit
07/12/1983US4393278 Telephone security system
07/12/1983CA1149981A2 Loudspeaker telephone apparatus
07/12/1983CA1149980A1 Bridge amplifier
07/07/1983WO1983002380A1 A method and an equipment for transmission of telephone calls to a portable, wireless telephone set
07/07/1983WO1983002376A1 Telephonic alphanumeric data transmission system
07/05/1983US4392206 Printer
07/05/1983US4392028 Pay telephone with sanitized tissue dispenser
07/05/1983US4392022 Television remote control system for selectively controlling a plurality of external apparatus
07/05/1983US4392017 Telephone handset lifting device
07/05/1983CA1149494A1 Telephone-switching system and novel public telephone instrument
06/1983
06/29/1983EP0082512A1 Method for the transmission of alphanumeric characters
06/28/1983US4390970 Rotating register utilizing field effect transistors
06/28/1983US4390843 Telephone system ring period detector
06/28/1983US4390754 Tone generator circuit
06/28/1983US4390753 Line interruption arrangement
06/28/1983US4390752 Ring detection circuit for a telephone answering device
06/28/1983US4390751 End of rewind detection in a telephone answering device having remote playout
06/28/1983CA1149091A1 Loudspeaking substation circuit
06/28/1983CA1149090A1 Electronic tone ringer
06/21/1983US4389547 Telephone set
06/21/1983US4389545 Remote rewind mechanism and control circuitry for a tape cassette telephone answering device
06/21/1983US4389544 Digital telephone apparatus
06/21/1983US4389543 Telephone-activated audio control circuit
06/21/1983CA1148677A1 Intraplant communication system
06/21/1983CA1148676A1 On-hook/off-hook status check circuit
06/15/1983EP0081036A1 Key-pad for telecommunication apparatuses, especially telephone apparatuses
06/14/1983US4388499 Line interruption circuit for use in a telephone set
06/14/1983US4388498 Voltage stabilizer suitable for use in a telephone set
06/14/1983CA1148240A1 Telephone exchange systems utilizing telephone sets
06/07/1983US4387274 Hook flash signal actuated telephone control device
06/07/1983US4387272 Method and apparatus for controlling a subscriber phone system including at least one automatic phone-answering machine
05/1983
05/31/1983US4386436 Television remote control system for selectively controlling external apparatus through the AC power line
05/31/1983US4386281 Circuit for detecting loss of supply voltage
05/31/1983US4386240 Push-button unit for telephone sets
05/31/1983US4386236 Automatic sound level control of telephone station
05/26/1983WO1983001881A1 A security system for sstv encryption
05/25/1983EP0079332A1 Circuit for generating analog signals
05/25/1983EP0016056B1 Telecommunications apparatus, e.g. a telephone, with long distance dialing lockout
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