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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:

Class Number Class Name Patents
455/401 Including call signaling (e.g., ringing, off-hook, dialing) 119
455/402 Over power line 221

Patents under this class:

Patent Number Title Of Patent Date Issued
8611824 Vehicle, communication system for vehicle, and communication controlling method for vehicle Dec. 17, 2013
8260247 Portable electronic device and method of operation Sep. 4, 2012
8229468 Using intelligent agents to perform flow path discovery in telecommunications systems and networks Jul. 24, 2012
8145188 Method for call charge transfer between mobile communication terminals Mar. 27, 2012
8028034 System and method for automatically learning mailbox configuration conventions Sep. 27, 2011
8023973 Expandable text messaging service protocol for use with a two-way radio transceiver Sep. 20, 2011
7974988 System and method for cross-carrier mobile device capability discovery Jul. 5, 2011
7715841 Radio communication system base station and mobile station May. 11, 2010
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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