US3596164A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Telephone control circuit
Assignee: Okonite Co
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Filing: 1969-09-17
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Granted: 1971-07-27
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Expires: 1989-09-17
Abstract
Abstract A control circuit for use at a subscriber station end signal converter having a high impedance constant current generator for producing voice transmission direct current and for controlling operation of other components of the signal converter. The control circuit also includes a trickle charge circuit for charging a battery of the subscriber station end signal converter, the control circuit allowing operation of the trickle charge circuit only during periods of nonoperation of the telephone set at the subscriber station.
Inventors
- 👤 Donald L Bise
- 👤 Ronald J Surprenant
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 05:46
CPC Classifications
H; H04; H04M; H04M19/00; H04M19/08; H02; H02J; H02J7/00; H02J7/90; H02J7/94
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
145 words
A control circuit including: an input circuit of direct voltage; switch means; a constant current generator circuit for energizing a load, said generator circuit including a first transistor having its emitter-collector circuit connectable by said switch means in series with a load across said input circuit; a switch transistor; voltage divider means connectable across said input circuit by said switch means providing a biasing potential for said switch transistor for rendering said switch transistor conductive when said switch means is closed; a control transistor; a first means operatively associated with said switch and control transistors for causing said control transistor to be conductive when said switch transistor is conductive; and second means operatively associated with said control transistor and said first transistor for controlling the conductivity of said first transistor and causing causing said first transistor to be conductive when said control transistor is conductive.
Claim 2
Dependent Claim
145 words
A control circuit including: an input circuit of direct voltage; switch means; a constant current generator circuit for energizing a load, said generator circuit including a first transistor having its emitter-collector circuit connectable by said switch means in series with a load across said input circuit; a switch transistor; voltage divider means connectable across said input circuit by said switch means providing a biasing potential for said switch transistor for rendering said switch transistor conductive when said switch means is closed; a control transistor; a first means operatively associated with said switch and control transistors for causing said control transistor to be conductive when said switch transistor is conductive; and second means operatively associated with said control transistor and said first transistor for controlling the conductivity of said first transistor and causing causing said first transistor to be conductive when said control transistor is conductive.
Claim 3
Dependent Claim
26 words
The control circuit of claim 1, and third means operatively associated with said switch transistor for providing a control voltage when said switch transistor is conductive.
Claim 4
Dependent Claim
65 words
The control circuit of claim 2, and a battery connected across said input circuit for energizing said input circuit with direct current; a second input circuit of direct current; and a charging circuit controlled by said control voltage of said third means for charging said battery when said switch transistor is nonconductive and preventing operation of said charging circuit when said switch transistor is conductive.
Claim 5
Dependent Claim
67 words
The control circuit of claim 3, wherein said charging circuit includes a charging transistor having its emitter-collector circuit connecting said battery across said second input circuit; and a second transistor for controlling the conductivity of said charging transistor said second transistor being rendered inoperative by said control voltage provided by said control means when said switch transistor is conductive to cause said charging transistor to be nonconductive.
Claim 6
Dependent Claim
178 words
A control circuit including: an input circuit of direct voltage; switch means; a constant current generator circuit for energizing a load, said generator circuit including a first transistor having its emitter-collector circuit connectable by said switch means in series with a load across said input circuit; a switch transistor; a first voltage divider means connectable across said input circuit by said switch means and opEratively associated with said switch transistor for rendering the emitter-collector circuit of said switch transistor conductive when said switch means is closed; a second voltage divider means connected in series with the emitter-collector circuit of said switch transistor across said input circuit; a control transistor; said second voltage divider means being operatively associated with said control transistor for causing the emitter-collector circuit of said control transistor to be rendered conductive when said switch transistor is rendered conductive; a third voltage divider means connected in series with the emitter-collector circuit of said control transistor for providing a biasing potential to said first transistor for controlling the conductivity of the emitter-collector circuit of said first transistor.
Claim 7
Dependent Claim
178 words
A control circuit including: an input circuit of direct voltage; switch means; a constant current generator circuit for energizing a load, said generator circuit including a first transistor having its emitter-collector circuit connectable by said switch means in series with a load across said input circuit; a switch transistor; a first voltage divider means connectable across said input circuit by said switch means and opEratively associated with said switch transistor for rendering the emitter-collector circuit of said switch transistor conductive when said switch means is closed; a second voltage divider means connected in series with the emitter-collector circuit of said switch transistor across said input circuit; a control transistor; said second voltage divider means being operatively associated with said control transistor for causing the emitter-collector circuit of said control transistor to be rendered conductive when said switch transistor is rendered conductive; a third voltage divider means connected in series with the emitter-collector circuit of said control transistor for providing a biasing potential to said first transistor for controlling the conductivity of the emitter-collector circuit of said first transistor.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |