| Patents for H04L 12 - Data switching networks (448,999) |
|---|
| 04/04/1978 | US4082921 Automatic subscriber interrogation system |
| 03/28/1978 | US4081787 Prioritied photo-isolated digital data transmission system |
| 03/28/1978 | US4081612 Method for building-up of routing addresses in a digital telecommunication network |
| 03/21/1978 | US4080040 Electrical jack and patch cord plug assemblies |
| 03/14/1978 | US4079209 Method and apparatus for limiting the number of build-up packets during the process of building up a routing address in a digital telecommunication network |
| 03/07/1978 | US4078228 Loop data highway communication system |
| 02/21/1978 | US4075606 Self-memorizing data bus system for random access data transfer |
| 02/14/1978 | US4074358 Test set for measuring jitter distortion of data pulses |
| 02/14/1978 | US4074066 Message verification and transmission error detection by block chaining |
| 01/31/1978 | US4071908 Adaptive polling technique |
| 01/31/1978 | US4071716 Dictation system |
| 01/31/1978 | US4071706 Data packets distribution loop |
| 01/31/1978 | US4071701 Method of and apparatus for addressing a buffer memory in a transit exchange for synchronous data signals |
| 01/10/1978 | US4068098 Method of and arrangement for addressing a switch memory in a transit exchange for synchronous data signals |
| 12/20/1977 | US4064486 Data communications loop synchronizer |
| 12/20/1977 | US4064360 High speed digital switch |
| 12/13/1977 | US4063220 Multipoint data communication system with collision detection |
| 12/06/1977 | US4061879 Method and apparatus for transmitting digital information signals from signal transmitters to signal receivers over switching apparatus |
| 11/15/1977 | US4058838 Packet-switched facsimile communications system |
| 11/15/1977 | US4058681 Information transmission system |
| 11/15/1977 | US4058672 Packet-switched data communications system |
| 10/25/1977 | US4055835 Line-seizing apparatus |
| 10/25/1977 | US4055808 Data communications network testing system |
| 10/18/1977 | US4054745 Motor control device for data terminals |
| 10/04/1977 | US4052737 Method and apparatus utilizing baudot code for categorizing and selectively distributing information to a plurality of utilization units |
| 09/27/1977 | US4051326 Arrangement for the remote switching-on and initialization of a data terminal |
| 09/20/1977 | US4049906 Message network for the transmission of digital telegrams with an address consisting of routing words |
| 09/13/1977 | US4048619 Secure two channel sca broadcasting system |
| 09/13/1977 | US4048446 Data transmission system |
| 09/13/1977 | US4048441 Error control for digital multipoint circuits |
| 09/06/1977 | US4046959 Data communication system using photocouplers |
| 08/30/1977 | US4044453 Method for the production of a diode matrix for character generators |
| 08/16/1977 | US4042783 Method and apparatus for byte and frame synchronization on a loop system coupling a CPU channel to bulk storage devices |
| 08/16/1977 | US4042780 Multiple message frame adaptor apparatus for loop communication system |
| 08/02/1977 | US4039757 Digital data communication network and control system therefor |
| 07/26/1977 | US4038601 Device for connecting peripheral units to a line for transmitting data by pulse code modulation |
| 07/12/1977 | US4035770 Switching system for use with computer data loop terminals and method of operating same |
| 07/05/1977 | US4034351 Method and apparatus for transmitting common information in the information processing system |
| 06/28/1977 | US4032899 Apparatus and method for switching of data |
| 06/28/1977 | US4032893 Reconfigurable data bus |
| 06/21/1977 | US4031512 Communications network for general purpose data communications in a heterogeneous environment |
| 06/21/1977 | US4031375 Arrangement for fault diagnosis in the communication controller of a program controlled data switching system |
| 06/21/1977 | US4031314 Arrangement for connecting information transducers in program controlled processing systems |
| 06/07/1977 | US4028667 Asynchronous, hierarchical loop communication system with independent local station control of access to inbound time portions without central control |
| 05/31/1977 | US4027099 Reducing teleprinter errors caused by primary power frequency variations |
| 05/31/1977 | US4027098 Method for establishing conference connections in dial-operated telecommunication exchanges |
| 05/17/1977 | US4024501 Line driver system |
| 04/19/1977 | US4019176 System and method for reliable communication of stored messages among stations over a single common channel with a minimization of service message time |
| 04/12/1977 | US4017149 Multiple access fiber optical bus communication system |
| 04/05/1977 | US4016369 Addressing arrangements for communications networks |
| 03/29/1977 | US4015241 Information processing system |
| 03/01/1977 | US4010326 Line selective time division communication system |
| 02/22/1977 | US4009469 Loop communications system with method and apparatus for switch to secondary loop |
| 02/22/1977 | US4009336 Digital signaling device |
| 02/08/1977 | US4007441 Method of data communications in a heterogenous environment |
| 02/01/1977 | US4006456 Loop fault location and isolation |
| 02/01/1977 | US4006303 Filtered transition distortion channel quality monitor |
| 01/18/1977 | US4004275 Self-clocking data entry unit system |
| 01/11/1977 | US4002847 Fault isolation in a serial-looped transmission system |
| 01/11/1977 | US4002842 Time multiplex loop telecommunication system |
| 01/04/1977 | US4001504 Automatic terminal data rate selection |
| 12/28/1976 | US4000378 Data communication system having a large number of terminals |
| 12/28/1976 | US4000363 Arrangement for the production of selection pulses in teleprinters |
| 12/21/1976 | US3999162 Time-division multiplex switching circuitry |
| 11/23/1976 | US3993870 Time multiplex system with separate data, sync and supervision busses |
| 11/02/1976 | US3990046 Multiple terminal computer system with mixed terminal data reception rates |
| 11/02/1976 | US3989892 Line concentrator for dealing with asynchronous and synchronous data signals in a common bit format for a time division data switching exchange |
| 10/26/1976 | US3988545 Method of transmitting information and multiplexing device for executing the method |
| 10/26/1976 | US3988544 Time-division switching network for switching multiformat multiplexed data |
| 10/19/1976 | US3987251 Time division switching network for switching multirate multiplexed data |
| 10/12/1976 | US3986020 Common medium optical multichannel exchange and switching system |
| 10/12/1976 | US3985962 Method of information transmission with priority scheme in a time-division multiplex communication system comprising a loop line |
| 10/12/1976 | US3985955 Apparatus for measuring the distortion of data signals |
| 10/05/1976 | US3984641 System for switching and safeguarding data in time-division multiplex switching networks |
| 10/05/1976 | US3984637 Computer terminal security system |
| 09/07/1976 | USRE28958 Synchronous disconnection and rearrangement |
| 09/07/1976 | US3979733 Digital data communications system packet switch |
| 09/07/1976 | US3979723 Digital data communication network and control system therefor |
| 08/31/1976 | US3978451 Controlling communications between computer devices over common bus |
| 08/31/1976 | US3978449 Method and apparatus for in-band signalling in data transmission |
| 08/31/1976 | US3978327 Program-controlled data processor having two simultaneously operating identical system units |
| 07/20/1976 | US3970994 Communication switching system |
| 07/06/1976 | US3968330 Code generator for teleprinters or data printers |
| 06/15/1976 | US3963871 Analysis device for establishing the binary value of asynchronous data signals |
| 06/15/1976 | US3963867 Method for indicating a free-line state in a binary data communication system |
| 06/01/1976 | US3961139 Time division multiplexed loop communication system with dynamic allocation of channels |
| 06/01/1976 | US3961130 Memory dial for teletypewriter subscribers |
| 05/25/1976 | US3959599 Call initiation delay arrangement for digital data switching system |
| 05/18/1976 | US3958226 Data communication system |
| 05/11/1976 | USRE28811 Interconnected loop data block transmission system |
| 05/11/1976 | US3956590 Switching arrangement for switching between different current values by means of mechanical or electronic switches |
| 04/20/1976 | US3952162 Time division digital switching network |
| 04/06/1976 | US3949168 Selectively clamped digital signal transmission system |
| 03/30/1976 | US3947818 Bus-coupler |
| 03/09/1976 | US3943283 Bidirectional single wire data transmission and wrap control |
| 02/24/1976 | US3940562 Transit exchange for time division multiplex asynchronous data |
| 01/27/1976 | US3935391 Time division multiplex switching system |
| 01/20/1976 | US3934093 Transit exchange for asynchronous data with unknown structure |
| 01/20/1976 | US3934088 Data terminal for connection to telephone or teleprinter facilities |