Patent US3887824A successfully refreshed from Google Patents.
US3887824A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Communication monitoring circuit
Assignee: Siemens AG
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Filing: 1973-01-05
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Granted: 1975-06-03
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Expires: 1993-01-05
Abstract
Abstract A circuit for monitoring transmission paths in telecommunication systems having a timing circuit connectable to the transmission line over an input circuit is described. The timing circuit includes a parallel combination of resistance and capacitance, and a transistor switching stage controls the charging of the capacitor, over which a switching element, such as a relay, is controlled. The input circuit includes a threshold connected circuit over a contact of the switching element. The threshold circuit is a bistable circuit having an adjustable switching point which is connectable to the timing circuit resistance through a transistor. The latter transistor is operable to couple an input to the timing circuit only upon an exceeding of a preset value of the threshold circuit.
Inventors
- 👤 Hans Joachim Blauert
- 👤 Filip Jejina
- 👤 Hans Reisch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:41
CPC Classifications
H; H04; H04L; H04L43/00; H04L43/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
210 words
A transmission line monitoring circuit for a telecommunication network for operating a time-dependent switching element upon the occurrence of predetermined conditions, comprising: input circuit means for coupling the current from a transmission line in said network to said monitoring circuit including a bistable circuit connected to said transmission line and adjustable to operate at a predetermined threshold value of current on said transmission line and switching means controlled by said bistable circuit, timing circuit means comprising parallel combination of a series connection of resistances and capacitance and a switching stage for determining the state of charge of said capacitance and means coupling said switching element to said switching stage so as to be energized by said switching stage, said switching element including contact means, said contact means being arranged between said switching means and said timing circuit means for controlling the charging and discharging times of said capacitance through said series connection of resistances in dependence on the operating state of said switching element by connecting said switching means during a first operating state of said contact means to a first junction point in said series connection of resistances and during a second operating state of said contact means to a second junction point in said series connection of resistances.
Claim 2
Dependent Claim
210 words
A transmission line monitoring circuit for a telecommunication network for operating a time-dependent switching element upon the occurrence of predetermined conditions, comprising: input circuit means for coupling the current from a transmission line in said network to said monitoring circuit including a bistable circuit connected to said transmission line and adjustable to operate at a predetermined threshold value of current on said transmission line and switching means controlled by said bistable circuit, timing circuit means comprising parallel combination of a series connection of resistances and capacitance and a switching stage for determining the state of charge of said capacitance and means coupling said switching element to said switching stage so as to be energized by said switching stage, said switching element including contact means, said contact means being arranged between said switching means and said timing circuit means for controlling the charging and discharging times of said capacitance through said series connection of resistances in dependence on the operating state of said switching element by connecting said switching means during a first operating state of said contact means to a first junction point in said series connection of resistances and during a second operating state of said contact means to a second junction point in said series connection of resistances.
Claim 3
Dependent Claim
210 words
A transmission line monitoring circuit for a telecommunication network for operating a time-dependent switching element upon the occurrence of predetermined conditions, comprising: input circuit means for coupling the current from a transmission line in said network to said monitoring circuit including a bistable circuit connected to said transmission line and adjustable to operate at a predetermined threshold value of current on said transmission line and switching means controlled by said bistable circuit, timing circuit means comprising parallel combination of a series connection of resistances and capacitance and a switching stage for determining the state of charge of said capacitance and means coupling said switching element to said switching stage so as to be energized by said switching stage, said switching element including contact means, said contact means being arranged between said switching means and said timing circuit means for controlling the charging and discharging times of said capacitance through said series connection of resistances in dependence on the operating state of said switching element by connecting said switching means during a first operating state of said contact means to a first junction point in said series connection of resistances and during a second operating state of said contact means to a second junction point in said series connection of resistances.
Claim 4
Dependent Claim
210 words
A transmission line monitoring circuit for a telecommunication network for operating a time-dependent switching element upon the occurrence of predetermined conditions, comprising: input circuit means for coupling the current from a transmission line in said network to said monitoring circuit including a bistable circuit connected to said transmission line and adjustable to operate at a predetermined threshold value of current on said transmission line and switching means controlled by said bistable circuit, timing circuit means comprising parallel combination of a series connection of resistances and capacitance and a switching stage for determining the state of charge of said capacitance and means coupling said switching element to said switching stage so as to be energized by said switching stage, said switching element including contact means, said contact means being arranged between said switching means and said timing circuit means for controlling the charging and discharging times of said capacitance through said series connection of resistances in dependence on the operating state of said switching element by connecting said switching means during a first operating state of said contact means to a first junction point in said series connection of resistances and during a second operating state of said contact means to a second junction point in said series connection of resistances.
Claim 5
Dependent Claim
78 words
The monitoring circuit defined in claim 1 wherein said connecting means is connected to said resistance, upon said contact means assuming a first operating state, such that the discharging time constant of said capacitance is greater than the charging time constant thereof, and wherein said connecting means is cOnnected to said resistance upon said contact means assuming a second operating state, such that the charging time constant of said capacitance is greater than the discharging time constant thereof.
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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) | 1978-06-02 | 1978-12-02 | 1979-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-02 | 1982-12-02 | 1983-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-02 | 1986-12-02 | 1987-06-03 | $7700.00 | Window Closed / Lapsed |