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Class Information
Number: 379/393
Name: Telephonic communications > Substation or terminal circuitry > Hold circuit
Description: Subject matter for maintaining a subscriber loop circuit in an active but noncommunicating mode.

Patents under this class:
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Patent Number Title Of Patent Date Issued
8494122 Interactive voice response (IVR) system call interruption handling Jul. 23, 2013
8284927 Telephone using an external media device to provide on-hold information Oct. 9, 2012
8259912 On-hold message system Sep. 4, 2012
8259917 System and method for generating one-way speech signal samples Sep. 4, 2012
8194829 Leaving a message for a party while on an active real-time communication Jun. 5, 2012
8130936 System and method for on hold caller-controlled activities and entertainment Mar. 6, 2012
8107596 Apparatus and method for providing on-hold information based on preference of user Jan. 31, 2012
7995744 Telephone interface circuit Aug. 9, 2011
7508929 Apparatus and method of simulating telephone "in use" signals in a line in a telephone ring system Mar. 24, 2009
7292869 Telephone equipment including a line holding system, an extension communication detecting system, and a notification system Nov. 6, 2007
7139391 DAA hook switch Nov. 21, 2006
7123707 Methods of controlling communications with at least two calling party devices by a user of a called party device Oct. 17, 2006
7085263 Network telephony devices, softwares and methods for discontinuing transmitting music-on-hold Aug. 1, 2006
7031462 Electronic inductor with transmit signal telephone line driver Apr. 18, 2006
6978011 Enhanced low pass filter Dec. 20, 2005
6959083 Loop current monitor circuitry and method for a communication system Oct. 25, 2005
6947546 Hook-flash simulation in parallel with off-hook devices Sep. 20, 2005
6873700 System and method for announcing a message through a private branch exchange Mar. 29, 2005
6870919 Mute status reminder for a communication device Mar. 22, 2005
6853725 Method and apparatus for off-hook management of plural subscriber premises devices connected to same telephone line Feb. 8, 2005
6850610 Telecommunications device and method for providing information during a call waiting condition Feb. 1, 2005
6836545 Communication system, exchange and communication holding control method Dec. 28, 2004
6807262 Central office control of receive and transmit handset volume Oct. 19, 2004
6785383 Telephone line switch using an optocooupler Aug. 31, 2004
6778664 Line current protection circuit and method for linear and nonlinear hold circuit Aug. 17, 2004
6751306 Local on-hold information service with user-controlled personalized menu Jun. 15, 2004
6704565 Method and apparatus for providing a hold termination message service in a communications network Mar. 9, 2004
6694012 System and method to provide control of music on hold to the hold party Feb. 17, 2004
6563916 System for transmitting a change in call queued/hold state across a communications network May. 13, 2003
6526041 Apparatus and method for music-on-hold delivery on a communication system Feb. 25, 2003
6430280 Telephone main unit and telephone control apparatus Aug. 6, 2002
6400804 On-hold activity selection apparatus and method Jun. 4, 2002
6240177 Communication device comprising an off-hook detection circuit May. 29, 2001
6219415 Call hold state notification across a communications network Apr. 17, 2001
6201865 Digital access arrangement circuitry and method for connecting to phone lines having a DC holding circuit with switchable time constants Mar. 13, 2001
6157713 Telephone hold circuit Dec. 5, 2000
6122346 Telephone on-hold response system Sep. 19, 2000
6031905 Network-based call hold stand by Feb. 29, 2000
5991398 Telephone terminal apparatus and method Nov. 23, 1999
5930339 Leaving a message on a held connection Jul. 27, 1999
5875231 Telephone call on hold service for a party placed on hold by another party Feb. 23, 1999
5822403 Automated telephone hold device Oct. 13, 1998
5815567 Communications interface providing isolation and ringdown features Sep. 29, 1998
5768355 Three-way call detection system Jun. 16, 1998
5764752 Off-hook telephone clearing system Jun. 9, 1998
5612997 Off-hook disconnect and reconnect ringer device Mar. 18, 1997
5602910 Control apparatus for switching station connections using a holding tone Feb. 11, 1997
5600715 Integrated loop current detector apparatus for a PSTN modem Feb. 4, 1997
5572587 Telephone system and method for easing wait time in queue Nov. 5, 1996
5557658 Communications marketing system Sep. 17, 1996

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