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Class Information
Number: 379/224
Name: Telephonic communications > Plural exchange network or interconnection > Tandem switching center
Description: Subject matter having a switching center or office located intermediate between an originating and receiving switching office for switching the trunks connected to such offices.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 5067149 |
Telephone line communications control system with dynamic call streaming |
Nov. 19, 1991 |
| 5056086 |
Apparatus for providing telephonic mass announcement service and methods for use therein |
Oct. 8, 1991 |
| 4972464 |
System for placement of a long distance telephone carrier point-of-presence and call routing |
Nov. 20, 1990 |
| 4907260 |
Telephone line communications control system |
Mar. 6, 1990 |
| 4896350 |
Arrangement for providing a call-connection service |
Jan. 23, 1990 |
| 4837799 |
Telephone line communications control system |
Jun. 6, 1989 |
| 4555594 |
Telephone interexchange signaling protocol |
Nov. 26, 1985 |
| 4464543 |
Network control center call trace |
Aug. 7, 1984 |
| 4059733 |
Call distributor for increasing switching system call termination rate |
Nov. 22, 1977 |
| 4048451 |
Arrangement for monitoring live call disposition signals |
Sep. 13, 1977 |
| 4021619 |
Improved digital telephone and switching system employing time division multiplex pulse code modulation |
May. 3, 1977 |
| 4007336 |
Class of call discriminating trunk circuit |
Feb. 8, 1977 |
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