US5912957A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Technique for reconnecting office line to key telephone system after power failure
Assignee: Samsung Electronics Co Ltd
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Filing: 1996-11-07
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Granted: 1999-06-15
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Expires: 2016-11-07
Abstract
Abstract A power failure shunting office line restoring circuit includes: a first relay having an office line tip port connected to a common port for connecting the tip port of the office line to a separate emergency telephone or a key telephone office line accommodating circuit in accordance with a first relay control signal; a second relay having an office line ring port connected to a common port for connecting the ring port of the office line to the emergency telephone or the key telephone office line accommodating circuit in accordance with a second relay control signal; a controller for generating the first and second relay control signals according to a power supply state or emergency telephone use state detection signal; first and second relay drivers for driving the first and second relays in accordance with the first and second relay control signals generated by the controller, and a detector connected to the first relay for detecting the use of the emergency telephone and for outputting the use state detection signal to the controller.
Inventors
- 👤 Moon-Kyeong Park
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:21
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/71; H04M1/715; H04M19/00
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
185 words
A power failure shunting office line restoring circuit comprising: a first relay having an office line tip port connected to a common port for connecting said tip port of said office line to one of a separate emergency telephone for use only in emergencies and a key telephone office line accommodating circuit in accordance with a first relay control signal; a second relay having an office line ring port connected to a common port for connecting said ring port of said office line to one of said emergency telephone and said key telephone office line accommodating circuit in accordance with a second relay control signal; a controller unit for generating said first and second relay control signals according to a power supply state or emergency telephone use state detection signal; first and second relay drivers unit for respectively driving said first and second relays in accordance with said first and second relay control signals generated by said controller; and a detector connected to said first relay for detecting the use of said emergency telephone and for outputting said use state detection signal to said controller.
Claim 2
Dependent Claim
185 words
A power failure shunting office line restoring circuit comprising: a first relay having an office line tip port connected to a common port for connecting said tip port of said office line to one of a separate emergency telephone for use only in emergencies and a key telephone office line accommodating circuit in accordance with a first relay control signal; a second relay having an office line ring port connected to a common port for connecting said ring port of said office line to one of said emergency telephone and said key telephone office line accommodating circuit in accordance with a second relay control signal; a controller unit for generating said first and second relay control signals according to a power supply state or emergency telephone use state detection signal; first and second relay drivers unit for respectively driving said first and second relays in accordance with said first and second relay control signals generated by said controller; and a detector connected to said first relay for detecting the use of said emergency telephone and for outputting said use state detection signal to said controller.
Claim 3
Dependent Claim
41 words
A power failure shunting office line restoring circuit as claimed in claim 1, wherein said first control signal generated by said controller is a high signal having a predetermined pulse width if the power is restored again after a power failure.
Claim 4
Dependent Claim
33 words
A power failure shunting office line restoring circuit as claimed in claim 2, wherein the predetermined pulse width is set to be smaller than an on-hook detection time of a telephone office exchange.
Claim 5
Dependent Claim
109 words
A power failure shunting office line restoring method during a power failure in a key telephone system having a separate emergency telephone for use only in emergencies and a key telephone office line accommodating circuit, said method comprising the steps of: switching an office line to the emergency telephone from the key telephone office line accommodating circuit when a power failure occurs; detecting the use of said emergency telephone when the power is restored to said key telephone system when said office line has been switched to said emergency telephone; and maintaining the connection of said office line to said emergency telephone when said emergency telephone is in use.
Claim 6
Dependent Claim
109 words
A power failure shunting office line restoring method during a power failure in a key telephone system having a separate emergency telephone for use only in emergencies and a key telephone office line accommodating circuit, said method comprising the steps of: switching an office line to the emergency telephone from the key telephone office line accommodating circuit when a power failure occurs; detecting the use of said emergency telephone when the power is restored to said key telephone system when said office line has been switched to said emergency telephone; and maintaining the connection of said office line to said emergency telephone when said emergency telephone is in use.
Claim 7
Dependent Claim
43 words
A power failure shunting office line restoring method during a power failure as claimed in claim 4, further comprising the step of: switching said office line to the key telephone office line accommodating circuit when said emergency telephone is no longer in use.
Claim 8
Dependent Claim
194 words
A power failure shunting office line restoring circuit comprising: a first switching means having an office line tip port connected to a common port for connecting said tip port of said office line to one of a separate emergency telephone line for use only in emergencies and a key telephone office line accommodating circuit in accordance with a first switching means control signal; a second switching means having an office line ring port connected to a common port for connecting said ring port of said office line to one of said emergency telephone line and said key telephone office line accommodating circuit in accordance with a second switching means control signal; a controller unit for generating said first and second switching means control signals according to a power supply state or emergency telephone use state detection signal; first and second switch drivers unit for respectively driving said first and second switching means in accordance with said first and second switching control signals generated by said controller; and a detector connected to said first switching means for detecting the use of said emergency telephone and for outputting said use state detection signal to said controller.
Claim 9
Dependent Claim
194 words
A power failure shunting office line restoring circuit comprising: a first switching means having an office line tip port connected to a common port for connecting said tip port of said office line to one of a separate emergency telephone line for use only in emergencies and a key telephone office line accommodating circuit in accordance with a first switching means control signal; a second switching means having an office line ring port connected to a common port for connecting said ring port of said office line to one of said emergency telephone line and said key telephone office line accommodating circuit in accordance with a second switching means control signal; a controller unit for generating said first and second switching means control signals according to a power supply state or emergency telephone use state detection signal; first and second switch drivers unit for respectively driving said first and second switching means in accordance with said first and second switching control signals generated by said controller; and a detector connected to said first switching means for detecting the use of said emergency telephone and for outputting said use state detection signal to said controller.
Claim 10
Dependent Claim
41 words
A power failure shunting office line restoring circuit as claimed in claim 6, wherein said first control signal generated by said controller is a high signal having a predetermined pulse width if the power is restored again after a power failure.
Claim 11
Dependent Claim
33 words
A power failure shunting office line restoring circuit as claimed in claim 7, wherein the predetermined pulse width is set to be smaller than an on-hook detection time of a telephone office exchange.
Claim 12
Dependent Claim
25 words
A power failure shunting office line restoring circuit as claimed in claim 6, wherein said first and second switching means each comprise solid state relays.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-06-14 | 2002-12-14 | 2003-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-06-14 | 2006-12-14 | 2007-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-06-14 | 2010-12-14 | 2011-06-15 | $7700.00 | Window Closed / Lapsed |