Patents
Sitemap › H04 - Electric communication technique › H04Q - Selecting › H04Q 3 - Selecting arrangements
Patents for H04Q 3 - Selecting arrangements (38,975)
03/1978
03/28/1978US4081625 Control circuitry for key telephone apparatus
03/28/1978US4081624 Key telephone intercom line system
03/28/1978US4081613 Bi-directional signalling arrangement for telecommunications systems
03/21/1978US4080517 Audio sensory apparatus and method for monitoring indicator lamp status of multi-line telephone instrument
03/14/1978US4079210 Ringing and testing control circuitry for communication systems
03/14/1978US4079208 Telecommunications transmission and signalling circuits
03/14/1978US4079207 Telecommunication switching system
03/14/1978US4079206 Switching arrangement for a telephone system for connecting a calling subscriber set to an idle connector set upon recognizing a loop in the connector set
03/07/1978US4078158 Call distributing automatic telephone installation
03/07/1978US4077373 Ignition timing control device for an internal combustion engine
02/1978
02/28/1978US4076967 Trunking procedure and arrangement for the connection of functional units
02/21/1978US4075608 Multiple-channel data switch
02/21/1978US4075433 Signal switching device
02/21/1978US4075432 Telephone concentrator
02/21/1978US4075431 Speech path system
02/21/1978US4075430 Line signalling over common highway for telecommunications system
02/14/1978US4074142 Optical cross-point switch
02/14/1978US4074072 Multiprocessor control of a partitioned switching network by control communication through the network
01/1978
01/31/1978US4071840 Switching device for reed relays in a matrix
01/24/1978US4070637 Redundant microwave configuration
01/10/1978US4068215 Cross-point switch matrix and multistage switching network using the same
01/10/1978US4068099 Method of and apparatus for switching service information units in a TDM system
01/03/1978US4066847 Automatic call answering and sequencing system
12/1977
12/27/1977US4065644 Electro-optical and electronic switching systems
12/27/1977US4065643 Communication facility integrity checking arrangement
12/20/1977US4064377 Electronic hybrid and hybrid repeater
12/13/1977US4063119 Schmitt trigger circuit
12/13/1977US4063045 Telecommunication line switching circuit
12/13/1977US4063043 Intraoffice alternate connection arrangement
12/06/1977US4061989 Redundancy switching system
12/06/1977US4061884 Arrangement for controlling thyristor networks
11/1977
11/29/1977US4060797 Serial digital bit stream code detector
11/29/1977US4060795 Scanning system
11/29/1977US4060699 Line connection reversing circuits
11/22/1977US4059774 Switching inverter with thermoconductive materials
11/22/1977US4059736 Dual testing system for supervising duplicated telecommunication equipment
11/22/1977US4059734 Method for transferring data into a data input during a telephone connection established over an interoffice trunk
11/22/1977US4059733 Call distributor for increasing switching system call termination rate
11/15/1977US4058770 Solid state subscriber selection switches for wired broadcasting systems
11/15/1977US4058741 Semiconductor switch circuit
11/15/1977US4058684 Apparatus for direct line switching
11/08/1977US4057693 Logic control for electronic key telephone line circuit
11/08/1977US4057691 Switching network with crosstalk elimination capability
11/01/1977US4056698 Special automatic trunk testing arrangement
11/01/1977US4056695 Key telephone line circuit tone-on-hold arrangement
11/01/1977US4056691 Telephone subscriber line circuit
11/01/1977US4056689 Telephone subscriber line circuit
10/1977
10/25/1977US4055731 Key telephone lamp control circuit
10/18/1977US4054756 Method and apparatus for automating special service call handling
10/11/1977US4053716 Switching network with a crosstalk elimination capability
10/11/1977US4053709 Telephone connector
09/1977
09/27/1977US4051518 Burst gate pulse generator
09/27/1977US4051391 Current-operated circuits and structures
09/20/1977US4050095 Call load sharing system between a plurality of data processing units
09/20/1977US4049925 Solenoid circuit for pushbutton release in telephones
09/20/1977US4049923 Switching network employing an improved interconnection
09/20/1977US4049922 Switching arrangement for telecommunication switching systems
09/13/1977US4048482 Arrangement for controlling a signal switching system and a method for using this arrangement
09/13/1977US4048451 Arrangement for monitoring live call disposition signals
09/13/1977US4048445 Method for through connection check in digital data system
09/06/1977US4046972 Key telephone station set circuit
09/06/1977US4046971 Switching arrangement for telephone subsets using impulse-type pushbutton calling
09/06/1977US4046966 Conference trunk circuit for an exchange
09/06/1977US4046962 Called party fraud detection in an automated coin system
08/1977
08/30/1977US4045623 Short circuit indicator for a terminator matrix
08/30/1977US4045622 Method of monitoring a network of peripheral elements handled by an electronic control unit
08/30/1977US4045619 Telephone control system
08/30/1977US4045617 Telecommunication switching network having a multistage reversed trunking arrangement
08/16/1977US4042785 Marker for telecommunication system
08/16/1977US4042784 Digit storer for telecommunication system
08/09/1977US4041465 Scanner-distributor apparatus for matrix system
08/09/1977US4041464 Data processing systems
08/09/1977US4041458 Arrangement for carrying out random selection among a plurality of selectable devices in a telecommunication system
08/09/1977US4041253 Bus monitor circuit for detecting malfunction of telephone circuits connected in groups to a common bus
08/09/1977US4041246 Thyristor cross-point switch with control
08/09/1977US4041245 Switching arrangement for telecommunication switching systems
08/02/1977US4040021 Circuit for increasing the apparent occupancy of a processor
08/02/1977US4039857 Dynamic biasing of isolation boat including diffused resistors
08/02/1977US4039763 Key telephone communication path interface
08/02/1977US4039758 Line identifying system of common control type automatic exchange
07/1977
07/26/1977US4038638 Efficient rearrangeable multistage switching networks
07/26/1977US4038498 Central office switching system with remote line switch
07/19/1977US4037117 Peak shut-off electronic switch
07/12/1977US4035773 Control of leakage currents in a switching matrix
07/12/1977US4035592 Subscriber monitoring unit for electronic telephone exchanges
07/12/1977US4035588 Right-of-way control circuit for key telephone intercommunication system
07/05/1977US4034347 Method and apparatus for controlling a multiprocessor system
07/05/1977US4034159 Switching system for multichannel lines
06/1977
06/28/1977US4032899 Apparatus and method for switching of data
06/28/1977US4032892 Semiconductor speech channel switch
06/28/1977US4032721 Stored program logic system using a common exchange circuit
06/21/1977US4031414 Circuit arrangement for producing high current pulses
06/21/1977US4031325 Called party fraud prevention in an automated coin system
06/21/1977US4031324 Automated coin arrangement providing interference free coin deposit detection during announcements
06/21/1977US4031314 Arrangement for connecting information transducers in program controlled processing systems
06/07/1977US4028676 Control of peripheral apparatus in telecommunication
06/07/1977US4028499 Universal/assigned night answering system for EPABX
06/07/1977US4028498 Private automatic branch exchange system and apparatus
06/07/1977US4028495 Time division communication system adapted to structural expansion
05/1977
05/31/1977US4027110 Key telephone system
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