Patent US4535202A successfully refreshed from Google Patents.
US4535202A
Expired / Lapsed
US
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Loop-circuit for telephone line
Assignee: GENERALE DE CONSTRUCTIONS TELEPHONIQUES SIEGE SOCIAL Cie
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Filing: 1983-06-30
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Granted: 1985-08-13
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Expires: 2003-06-30
Abstract
Abstract A loop-circuit for a telephone line is provided that includes a transistor having a first electrode directly connected to one of the wires of the line, a second electrode connected to the other of the wires of the line by means of a resistor, a gate electrode thereof being connected via a resistor to one of the wires of the line, and by means of a capacitor to the other wire of the line, wherein a switch is arranged to cut-off the transistor and another switch is arranged or provided to disconnect one of the plates of the capacitor from the rest of the circuit.
Inventors
- 👤 Bernard Meunier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:59
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/26; H04M1/30; H04M1/31; H04M7/00; H04M7/0096
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
152 words
A loop-circuit for a telephone line comprising a gyrator circuit consisting of a transistor of which a first electrode is directly connected to one of the wires of the line, of which a second electrode is connected to the other of the wires of the line via a resistor, of which the gate electrode is connected via a resistor to said one of the wires of the line, and via a capacitor to said other wire of the line, characterized in that a switch (SC2) directly connected between the gate electrode of said transistor (T1) and said other wire of the line is arranged responsive to a signal cutting off said transistor (T1), and that another switch (SC1) directly connected between said capacitor (C1) and said other wire of the line is arranged responsive to a signal disconnecting one of the plates of said capacitor (C1) from the rest of the circuit.
Claim 2
Dependent Claim
152 words
A loop-circuit for a telephone line comprising a gyrator circuit consisting of a transistor of which a first electrode is directly connected to one of the wires of the line, of which a second electrode is connected to the other of the wires of the line via a resistor, of which the gate electrode is connected via a resistor to said one of the wires of the line, and via a capacitor to said other wire of the line, characterized in that a switch (SC2) directly connected between the gate electrode of said transistor (T1) and said other wire of the line is arranged responsive to a signal cutting off said transistor (T1), and that another switch (SC1) directly connected between said capacitor (C1) and said other wire of the line is arranged responsive to a signal disconnecting one of the plates of said capacitor (C1) from the rest of the circuit.
Claim 3
Dependent Claim
20 words
A loop-circuit as defined in claim 1, characterized in that said transistor (T1) is realized according to the V-MOS technology
Claim 4
Dependent Claim
43 words
A loop-circuit as defined in claim 1, characterized in that said switch (SC2) is an optocoupler comprising, particularly, a phototransistor (TL3) whose emitter-collector circuit is directly connected between the gate electrode of said transistor (T1) and said other wire of the line (LR).
Claim 5
Dependent Claim
44 words
A loop-circuit as defined in claim 1, characterized in that the other switch (SC1) is a two-way switch realized by means of two optocouplers (OC1, OC2) of which the phototransistors (TL1, TL2) are series - connected - oppositely - poled with the capacitor (C1).
References Cited (Backward Citations)
FR2145074A5
Cited
US3801837A
Cited
FR2251975A1
Cited
US3987319A
Cited
US4037120A
Cited
US4282604A
Cited
US4476351A
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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) | 1988-08-12 | 1989-02-11 | 1989-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-12 | 1993-02-11 | 1993-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-12 | 1997-02-11 | 1997-08-13 | $7700.00 | Window Closed / Lapsed |