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Class Information
Number: 379/229
Name: Telephonic communications > Plural exchange network or interconnection > Interexchange signalling
Description: Subject matter including transmission of control or supervisory signals between exchanges.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 4706278 |
Interface circuit for transmitting keycodes to a CENTREX |
Nov. 10, 1987 |
| 4706279 |
Arrangement for initializing a CENTREX console interface circuit |
Nov. 10, 1987 |
| 4680786 |
Communication system for providing business communication features to cellular mobile telecommunication customers |
Jul. 14, 1987 |
| 4638123 |
Circuit arrangement for a small PABX with a switching matrix that has electronic crosspoints |
Jan. 20, 1987 |
| 4622439 |
Detection of ground or loop start configuration in telephone loop signalling circuit |
Nov. 11, 1986 |
| 4599490 |
Control of telecommunication switching systems |
Jul. 8, 1986 |
| 4555594 |
Telephone interexchange signaling protocol |
Nov. 26, 1985 |
| 4446337 |
Method and apparatus for revertive automatic intercept message delivery in a telephone system |
May. 1, 1984 |
| 4417335 |
Digital satellite telephone office |
Nov. 22, 1983 |
| 4293735 |
Nodal structure switching network |
Oct. 6, 1981 |
| 4247740 |
Trunk interface circuit |
Jan. 27, 1981 |
| 4211895 |
Electronic telephone system with time division multiplexed signalling |
Jul. 8, 1980 |
| 4136264 |
Private automatic branch exchange having two exchange units |
Jan. 23, 1979 |
| 4086439 |
Class of line identifier apparatus and method therefor |
Apr. 25, 1978 |
| 4085293 |
Traffic usage recorder |
Apr. 18, 1978 |
| 4076967 |
Trunking procedure and arrangement for the connection of functional units |
Feb. 28, 1978 |
| 4068101 |
Method and apparatus for the automatic communication of two telephone subscribers |
Jan. 10, 1978 |
| 4064372 |
Systems for and methods for PBX toll restriction |
Dec. 20, 1977 |
| 4059733 |
Call distributor for increasing switching system call termination rate |
Nov. 22, 1977 |
| 4048450 |
Trunk circuit traffic analyzer |
Sep. 13, 1977 |
| 4013843 |
Marker for extending calls to remote junctions in a telecommunications system |
Mar. 22, 1977 |
| 4002850 |
Trunk adapter |
Jan. 11, 1977 |
| 3995117 |
Message billing arrangement for a communication system |
Nov. 30, 1976 |
| 3991278 |
Line protection switching system |
Nov. 9, 1976 |
| 3969589 |
Telephone switching system having attendant queuing facilities |
Jul. 13, 1976 |
| 3959593 |
Traffic analysis from a scanner using a micro-processor |
May. 25, 1976 |
| 3958086 |
Telephone-signal receiver for switching exchanges having centralized logic circuits |
May. 18, 1976 |
| 3943298 |
Automatic number identification |
Mar. 9, 1976 |
| 3936615 |
Trunk transfer circuit |
Feb. 3, 1976 |
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