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Class Information
Number: 455/400
Name: Telecommunications > Having single-channel telephone carrier
Description: Subject matter wherein a single telephone speech signal on wired link modulates a carrier signal which has a frequency above the range of human audibility.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7603419 |
System and method for automatically learning mailbox configuration conventions |
Oct. 13, 2009 |
| 7519009 |
Virtual exterior gateway protocol and related methods |
Apr. 14, 2009 |
| 7107037 |
Reserving channel elements to maximize utilization of resources and prevent blocking of calls |
Sep. 12, 2006 |
| 7062251 |
Managing critical care physiologic data using data synthesis technology (DST) |
Jun. 13, 2006 |
| 6128480 |
Fixed subscriber unit for telecommunications |
Oct. 3, 2000 |
| 5652570 |
Individual location system |
Jul. 29, 1997 |
| 5513248 |
Cordless telephone micro-cellular system |
Apr. 30, 1996 |
| 5315639 |
Hands-free intercom system |
May. 24, 1994 |
| 5125026 |
Internal telephone intercom system |
Jun. 23, 1992 |
| 4847888 |
Field telephone system |
Jul. 11, 1989 |
| 4734932 |
Telephone local intercom system |
Mar. 29, 1988 |
| 4701945 |
Carrier current transceiver |
Oct. 20, 1987 |
| 4479033 |
Telephone extension system utilizing power line carrier signals |
Oct. 23, 1984 |
| 4396808 |
Telephone system with a ground or wire return |
Aug. 2, 1983 |
| 4380687 |
Power supply control circuit for subscriber carrier telephone system |
Apr. 19, 1983 |
| 4229625 |
Repeater level control circuit |
Oct. 21, 1980 |
| 4152546 |
Ringer power generator circuit for carrier subscriber station terminal |
May. 1, 1979 |
| 3934089 |
Automatic disconnect circuit for subscriber carrier telephone system |
Jan. 20, 1976 |
| 3932712 |
Telephone transmission system |
Jan. 13, 1976 |
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