Patent US3825699A successfully refreshed from Google Patents.
US3825699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Calling party control circuit
Assignee: AG Communication Systems Corp
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Filing: 1972-11-29
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Granted: 1974-07-23
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Expires: 1992-11-29
Abstract
Abstract Two circuits are disclosed for loading a telephone line in response to the receipt of incoming ringing signals and includes means responsive to the calling party going on-hook to release the line. A unilateral switching device is included in each circuit for loading and releasing the telephone line. Means responsive to incoming ringing signals are included to trigger the switching device into conduction to load the line.
Inventors
- 👤 D Danner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:55
CPC Classifications
H; H04; H04M; H04M1/00; H04M1/64; H04M1/65; H04M1/654
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
122 words
A circuit for loading a telephone line in response to the receipt of incoming ringing signals, said circuit comprising: first and second unilateral switching devices each having a control electrode; means for connecting said devices across said telephone line; first diode means selectively connectible between one conductor of said telephone line and the control electrode of said first unilateral switching device; second diode means selectively connectible between another conductor of said telephone line and the control electrode of said second unilateral switching device; and means responsive to incoming ringing signals for connecting the control electrodes of said unilateral switching devices to their respective diode means whereby one of said unilateral switching devices is allowed to conduct and said telephone line is loaded.
Claim 2
Dependent Claim
122 words
A circuit for loading a telephone line in response to the receipt of incoming ringing signals, said circuit comprising: first and second unilateral switching devices each having a control electrode; means for connecting said devices across said telephone line; first diode means selectively connectible between one conductor of said telephone line and the control electrode of said first unilateral switching device; second diode means selectively connectible between another conductor of said telephone line and the control electrode of said second unilateral switching device; and means responsive to incoming ringing signals for connecting the control electrodes of said unilateral switching devices to their respective diode means whereby one of said unilateral switching devices is allowed to conduct and said telephone line is loaded.
Claim 3
Dependent Claim
19 words
The circuit as claimed in claim 1 wherein said first and second unilateral switching devices comprise silicon controlled rectifiers.
Claim 4
Dependent Claim
21 words
The circuit as claimed in claim 1 wherein said means for connecting said devices across said telephone line includes a relay.
Claim 5
Dependent Claim
17 words
The circuit as claimed in claim 1 wherein said means responsive to incoming ringing includes a relay.
Claim 6
Dependent Claim
47 words
The circuit as claimed in claim 4 including means for rectifying incoming ringing signals and means connecting the output of said rectifying means to said relay whereby upon operation of said relay said diodes are connected to their respective unilateral switChing devices and their respective line conductors.
Claim 7
Dependent Claim
83 words
A circuit for loading a telephone line in response to the receipt of incoming ringing signals, said circuit comprising: a silicon controlled rectifier having anode, cathode and gate terminals; means for connecting said anode to one conductor of said telephone line; means for connecting said cathode to another conductor of said telephone line; and electromagnetic relay means responsive to ringing signals for connecting a trigger potential to said gate terminal to allow said silicon controlled rectifier to conduct, thereby loading said telephone line.
Claim 8
Dependent Claim
83 words
A circuit for loading a telephone line in response to the receipt of incoming ringing signals, said circuit comprising: a silicon controlled rectifier having anode, cathode and gate terminals; means for connecting said anode to one conductor of said telephone line; means for connecting said cathode to another conductor of said telephone line; and electromagnetic relay means responsive to ringing signals for connecting a trigger potential to said gate terminal to allow said silicon controlled rectifier to conduct, thereby loading said telephone line.
Claim 9
Dependent Claim
41 words
The circuit as claimed in claim 6 wherein the circuit path from said one conductor of said telephone line, through said anode and cathode terminals of said silicon controlled rectifier, to said another conductor of said telephone line includes a relay.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |