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Class Information
Number: 379/381
Name: Telephonic communications > Supervisory or control line signaling > Using line or loop condition detection (e.g., line circuit) > Busy test or make busy
Description: Subject matter for determining whether or not a loop or line connected to a terminal is in use, or to simulate such an in-use condition on a line.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7095824 |
Instructive out-of-service telephone lines |
Aug. 22, 2006 |
| 7039685 |
Method and apparatus for conducting subscriber's phone testing remotely via the internet |
May. 2, 2006 |
| 6934382 |
Method for recognizing an off-hook condition on a single subscriber line with two terminal devices |
Aug. 23, 2005 |
| 6879686 |
Line take-up detection circuit |
Apr. 12, 2005 |
| 6868156 |
Non-voice signal repeater for speech coders |
Mar. 15, 2005 |
| 6621905 |
Earphone support |
Sep. 16, 2003 |
| 6449360 |
Cleaning method for telephone number list and system implemented therefor |
Sep. 10, 2002 |
| 6393123 |
Method and modem circuit for determining connection status of a phone line |
May. 21, 2002 |
| 6358519 |
Germ-resistant communication and data transfer/entry products |
Mar. 19, 2002 |
| 6201854 |
System and method for telephone number verification and identification |
Mar. 13, 2001 |
| 6173040 |
Telephone line state detecting device |
Jan. 9, 2001 |
| 5825852 |
Multisensing circuitry for class signals and stutter dial tone in visual message waiting indicator |
Oct. 20, 1998 |
| 5812658 |
Method and circuit for failsafe switch-hook detection during fault in a telephone system |
Sep. 22, 1998 |
| 5805687 |
Subscriber equipment muting method and apparatus |
Sep. 8, 1998 |
| 5796816 |
Device and method for cleaning telephone number list |
Aug. 18, 1998 |
| 5636267 |
Cleaning system for telephone number list |
Jun. 3, 1997 |
| 5592529 |
Telephone inadvertent off-hook condition detector |
Jan. 7, 1997 |
| 5521974 |
Line in-use indicator for a telephone set and facsimile machine connected to a single telephone line |
May. 28, 1996 |
| 5428670 |
Communications marketing system |
Jun. 27, 1995 |
| 5355407 |
Phone busy circuit |
Oct. 11, 1994 |
| 5321740 |
Telephone marketing system |
Jun. 14, 1994 |
| 5251256 |
Independent hysteresis apparatus for tone detection |
Oct. 5, 1993 |
| 5083308 |
Arrangement for determining switch port status at an adjunct processor |
Jan. 21, 1992 |
| 5065424 |
Apparatus for servicing telephones from a remote location |
Nov. 12, 1991 |
| 4817137 |
Apparatus for remotely determining hook status conditions |
Mar. 28, 1989 |
| 4792969 |
Line condition data collecting system for a telephone exchange |
Dec. 20, 1988 |
| 4647723 |
Circuit for detection of off-hook condition of extension telephones |
Mar. 3, 1987 |
| 4629832 |
Communication system administration method and circuitry |
Dec. 16, 1986 |
| 4528664 |
Call progress signal monitor and method for telephone systems |
Jul. 9, 1985 |
| 4476557 |
Duplex signaling circuit |
Oct. 9, 1984 |
| 4320260 |
Circuit arrangement for determining the connection condition of a subscriber line in a telecommunications network |
Mar. 16, 1982 |
| 4320259 |
Electronic selector for telecommunications switching |
Mar. 16, 1982 |
| 4291200 |
Voice and data switching arrangement |
Sep. 22, 1981 |
| 4270024 |
Telephone line activity monitor |
May. 26, 1981 |
| 4201896 |
Telephone polling apparatus using a plurality of timers to detect the line conditions |
May. 6, 1980 |
| 4166929 |
Interoffice callback arrangement |
Sep. 4, 1979 |
| 4150257 |
Communication system call coverage arrangements |
Apr. 17, 1979 |
| 4146752 |
Seizing current delay circuit for the test switching means of a telecommunication switching system |
Mar. 27, 1979 |
| 4140879 |
Control circuit for transfer of auxiliary telephone equipment |
Feb. 20, 1979 |
| 4110566 |
Switching network control arrangement |
Aug. 29, 1978 |
| 4069396 |
Power saving circuit for use with a converter circuit in a telephone switching installation |
Jan. 17, 1978 |
| 4022978 |
Event monitoring transceiver |
May. 10, 1977 |
| 4009352 |
Multiple link circuit for a port multiplexer |
Feb. 22, 1977 |
| 3999018 |
Timer associated with CB relay |
Dec. 21, 1976 |
| 3997735 |
Telephone station make-busy circuit |
Dec. 14, 1976 |
| 3967071 |
Switching system of stored program control type |
Jun. 29, 1976 |
| 3963874 |
Busy-test arrangement for electronic private automatic branch exchange |
Jun. 15, 1976 |
| 3952165 |
Tie trunk control arrangement |
Apr. 20, 1976 |
| 3949176 |
Method of and apparatus for all busy detection |
Apr. 6, 1976 |
| 3946163 |
Port multiplexer for telephone signal processing systems |
Mar. 23, 1976 |
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