US3344308A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low voltage indicator circuit
Assignee: North American Aviation Corp
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Filing: 1965-03-10
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Granted: 1967-09-26
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Expires: 1985-03-10
Abstract
No abstract record available.
Inventors
- 👤 James L Atkinson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:49
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/18
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
168 words
AN INDICATOR CIRCUIT COMPRISING IN COMBINATION: A GLOW DISCHARGE LAMP HAVING A FIRING POTENTIAL AND AN EXTINGUISHING POTENTIAL; A SOURCE OF UNIDIRECTIONAL PERIODIC PULSATING POTENTIAL WHOSE PEAK AMPLITUDE IS GREATER THAN SAID FIRING POTENTIAL, SAID SOURCE HAVING FIRST AND SECOND TERMINALS; A FIRST AND SECOND RESISTOR SERIALLY CONNECTED BETWEEN SAID FIRST AND SAID SECOND TERMINALS TO FORM A POTENTIAL DIVIDER WITH THE POTENTIAL ACROSS SAID FIRST RESISTOR BEING BELOW SAID FIRING POTENTIAL; A THIRD RESISTOR CONNECTED IN SERIES WITH SAID GLOW DISCHARGE LAMP ACROSS SAID FIRST RESISTOR; A TRANSISTOR HAVING BASE, EMITTER AND COLLECTOR ELECTRODES, SAID COLLECTOR-EMITTER ELECTRODES CONNECTED ACROSS SAID SECOND RESISTOR; AN INPUT TERMINAL RESPONSIVELY CONNECTED TO SAID BASE FOR RECEIVING INPUT PULSES FOR TURNING SAID TRANSISTOR ON AND OFF SUCH THAT IN SAID ON CONDITION SUBSTANTIALLY ALL CURRENT FLOW THROUGH SAID SECOND RESISTOR IS BYPASSED AND THE POTENTIAL ACROSS SAID FIRST RESITOR IS PERIODICALLY ABOVE SAID FIRING POTENTIAL AND IN SAID OFF CONDITION THE POTENTIAL ACROSS SAID FIRST RESISTOR IS NEVER ABOVE SAID FIRING POTENTIAL.
Claim 2
Dependent Claim
168 words
AN INDICATOR CIRCUIT COMPRISING IN COMBINATION: A GLOW DISCHARGE LAMP HAVING A FIRING POTENTIAL AND AN EXTINGUISHING POTENTIAL; A SOURCE OF UNIDIRECTIONAL PERIODIC PULSATING POTENTIAL WHOSE PEAK AMPLITUDE IS GREATER THAN SAID FIRING POTENTIAL, SAID SOURCE HAVING FIRST AND SECOND TERMINALS; A FIRST AND SECOND RESISTOR SERIALLY CONNECTED BETWEEN SAID FIRST AND SAID SECOND TERMINALS TO FORM A POTENTIAL DIVIDER WITH THE POTENTIAL ACROSS SAID FIRST RESISTOR BEING BELOW SAID FIRING POTENTIAL; A THIRD RESISTOR CONNECTED IN SERIES WITH SAID GLOW DISCHARGE LAMP ACROSS SAID FIRST RESISTOR; A TRANSISTOR HAVING BASE, EMITTER AND COLLECTOR ELECTRODES, SAID COLLECTOR-EMITTER ELECTRODES CONNECTED ACROSS SAID SECOND RESISTOR; AN INPUT TERMINAL RESPONSIVELY CONNECTED TO SAID BASE FOR RECEIVING INPUT PULSES FOR TURNING SAID TRANSISTOR ON AND OFF SUCH THAT IN SAID ON CONDITION SUBSTANTIALLY ALL CURRENT FLOW THROUGH SAID SECOND RESISTOR IS BYPASSED AND THE POTENTIAL ACROSS SAID FIRST RESITOR IS PERIODICALLY ABOVE SAID FIRING POTENTIAL AND IN SAID OFF CONDITION THE POTENTIAL ACROSS SAID FIRST RESISTOR IS NEVER ABOVE SAID FIRING POTENTIAL.
References Cited (Backward Citations)
US2927247A
Cited
US3225215A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-09-25 | 1971-03-27 | 1971-09-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-09-25 | 1975-03-27 | 1975-09-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-09-25 | 1979-03-27 | 1979-09-26 | $7700.00 | Window Closed / Lapsed |