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Class Information
Number: 379/242
Name: Telephonic communications > Centralized switching system
Description: Subject matter which selectively connects two telephone subscriber lines for communication.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 4792969 |
Line condition data collecting system for a telephone exchange |
Dec. 20, 1988 |
| 4788657 |
Communication system having reconfigurable data terminals |
Nov. 29, 1988 |
| 4782506 |
Arrangement for operating and maintaining a telecommunications system |
Nov. 1, 1988 |
| 4723274 |
Arrangement for transferring data to an attendant console |
Feb. 2, 1988 |
| 4706277 |
Interface circuit for transmitting command codes to an attendant console |
Nov. 10, 1987 |
| 4706278 |
Interface circuit for transmitting keycodes to a CENTREX |
Nov. 10, 1987 |
| 4706276 |
Arrangement for transferring data to a centrex |
Nov. 10, 1987 |
| 4533914 |
Remotely controlled crossconnection system |
Aug. 6, 1985 |
| 4231017 |
Switching matrix equipment having a series circuit of relay coil and self-holding diode at each crosspoint |
Oct. 28, 1980 |
| 4160130 |
Essential user bypass circuit for telephone switching system |
Jul. 3, 1979 |
| 4128742 |
Rugged crosspoints for communication systems |
Dec. 5, 1978 |
| 4128741 |
Electronic crosspoint array |
Dec. 5, 1978 |
| 4056690 |
Automatic number identification in subscriber loop carrier systems |
Nov. 1, 1977 |
| 3942040 |
Semiconductor speech path switch circuitry |
Mar. 2, 1976 |
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