US3147407A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Positive action relay control circuit incorporating a blocking oscillator
Assignee: Ambac International Corp
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Filing: 1958-10-10
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Granted: 1964-09-01
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Expires: 1978-10-10
Abstract
No abstract record available.
Inventors
- 👤 Warner Harold
- 👤 Weiss Philip
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:08
CPC Classifications
F; F41; F41G; F41G7/00; F41G7/20; F41G7/30; F41G7/301; F41G7/306; H; H03; H03K; H03K17/00; H03K17/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
154 words
A CONTROL CIRCUIT COMPRISING A RELAY, A TRANSISTOR ASSOCIATED WITH SAID RELAY NORMALLY NON-CONDUCTIVE AND ADAPTED TO BECOME CONDUCTIVE TO OPERATE SAID RELAY WHEN A SIGNAL OF A PREDETERMINED AMPLITUDE IS APPLIED THERETO, A BLOCKING OSCILLATOR FOR PROVIDING CONSTANT AMPLITUDE SIGNALS SUFFICIENT IN AMPLITUDE TO TRIGGER SAID TRANSISTOR TO A CONDUCTIVE STATE, SAID SIGNAL BEING BELOW SAID PREDETERMINED AMPLITUDE WHEN SAID BLOCKING OSCILLATOR IS INOPERATIVE, A THRESHOLD LEVEL CONTROL CIRCUIT, MEANS FOR APPLYING A VARIABLE AMPLITUDE SIGNAL TO SAID THRESHOLD LEVEL CONTROL CIRCUIT, MEANS FOR APPLYING THE OUTPUT SIGNAL FROM SAID THRESHOLD LEVEL CONTROL CIRCUIT TO TRIGGER SAID BLOCKING OSCILLATOR INTO OPERATION, MEANS FOR RECTIFYING THE OUTPUT SIGNAL FROM SAID BLOCKING OSCILLATOR, MEANS FOR APPLYING THE RECTIFIED SIGNAL FROM SAID RECTIFYING MEANS TO SAID TRANSISTOR TO OPERATE SAID RELAY WHEN SAID VARIABLE AMPLITUDE SIGNAL EXCEEDS SAID THRESHOLD LEVEL AND TO MAINTAIN SAID RELAY INOPERATIVE WHEN SAID VARIABLE AMPLITUDE SIGNAL IS BELOW SAID THRESHOLD LEVEL.
Claim 2
Dependent Claim
154 words
A CONTROL CIRCUIT COMPRISING A RELAY, A TRANSISTOR ASSOCIATED WITH SAID RELAY NORMALLY NON-CONDUCTIVE AND ADAPTED TO BECOME CONDUCTIVE TO OPERATE SAID RELAY WHEN A SIGNAL OF A PREDETERMINED AMPLITUDE IS APPLIED THERETO, A BLOCKING OSCILLATOR FOR PROVIDING CONSTANT AMPLITUDE SIGNALS SUFFICIENT IN AMPLITUDE TO TRIGGER SAID TRANSISTOR TO A CONDUCTIVE STATE, SAID SIGNAL BEING BELOW SAID PREDETERMINED AMPLITUDE WHEN SAID BLOCKING OSCILLATOR IS INOPERATIVE, A THRESHOLD LEVEL CONTROL CIRCUIT, MEANS FOR APPLYING A VARIABLE AMPLITUDE SIGNAL TO SAID THRESHOLD LEVEL CONTROL CIRCUIT, MEANS FOR APPLYING THE OUTPUT SIGNAL FROM SAID THRESHOLD LEVEL CONTROL CIRCUIT TO TRIGGER SAID BLOCKING OSCILLATOR INTO OPERATION, MEANS FOR RECTIFYING THE OUTPUT SIGNAL FROM SAID BLOCKING OSCILLATOR, MEANS FOR APPLYING THE RECTIFIED SIGNAL FROM SAID RECTIFYING MEANS TO SAID TRANSISTOR TO OPERATE SAID RELAY WHEN SAID VARIABLE AMPLITUDE SIGNAL EXCEEDS SAID THRESHOLD LEVEL AND TO MAINTAIN SAID RELAY INOPERATIVE WHEN SAID VARIABLE AMPLITUDE SIGNAL IS BELOW SAID THRESHOLD LEVEL.
References Cited (Backward Citations)
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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) | 1967-09-01 | 1968-03-02 | 1968-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-01 | 1972-03-02 | 1972-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-01 | 1976-03-02 | 1976-09-01 | $7700.00 | Window Closed / Lapsed |