US3150294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric control or monitoring equipment or apparatus
Assignee: EK Cole Ltd
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Filing: 1960-03-29
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Granted: 1964-09-22
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Expires: 1980-03-29
Abstract
No abstract record available.
Inventors
- 👤 Pranab R Dastidar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:06
CPC Classifications
G; G08; G08B; G08B29/00; G08B29/16; G05; G05B; G05B9/00; G05B9/02; G08B29/12; G08B29/14; G21; G21C; G21C7/00; G21C7/36; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
151 words
IN A MONITORING MEANS FOR A FAIL-SAFE CONTROL CIRCUIT, A TRIGGER CIRCUIT INCLUDING A PAIR OF REGENERATING COUPLED TRANSISTOR, MEANS FOR IMPRESSING THE SIGNAL ON SAID TRIGGER CIRCUIT, MEANS FOR IMPRESSING ON THE INPUT OF THE FIRST TRANSISTOR OF SAID TRIGGER CIRCUIT A TRAIN OF NARROW ELECTRIC PULSES, A RELAY IN AN OPERATING CIRCUIT CONNECTED TO SAID TRIGGER CIRCUIT, MEANS IN SAID TRIGGER CIRCUIT FOR PERMITTING SAID PULSES TO REACH SAID RELAY OPERATING CIRCUIT ONLY WHEN THE TRIGGER AND RELAY CIRCUITS ARE FUNCTIONING NORMALLY, MEANS FORMING A SHORT CIRCUIT PATH FOR SAID RELAY OPERATING CIRCUIT, TRANSISTOR MEANS COUPLED TO SAID RELAY CIRCUIT FOR MAINTIAINING SAID SHORT CIRCUIT PATH INEFFECTIVE IN THE PRESENCE OF THE NARROW PULSE TRAIN IN THE RELAY CIRCUIT AND FOR RENDERING SAID SHORT CIRCUIT EFFECTIVE TO DISABLE THE RELAY WHEN SAID TRANSISTOR MEANS IS DEFECTIVE AND IN THE ABSENCE OF THE NARROW PULSE TRAIN IN SAID RELAY CIRCUIT.
Claim 2
Dependent Claim
151 words
IN A MONITORING MEANS FOR A FAIL-SAFE CONTROL CIRCUIT, A TRIGGER CIRCUIT INCLUDING A PAIR OF REGENERATING COUPLED TRANSISTOR, MEANS FOR IMPRESSING THE SIGNAL ON SAID TRIGGER CIRCUIT, MEANS FOR IMPRESSING ON THE INPUT OF THE FIRST TRANSISTOR OF SAID TRIGGER CIRCUIT A TRAIN OF NARROW ELECTRIC PULSES, A RELAY IN AN OPERATING CIRCUIT CONNECTED TO SAID TRIGGER CIRCUIT, MEANS IN SAID TRIGGER CIRCUIT FOR PERMITTING SAID PULSES TO REACH SAID RELAY OPERATING CIRCUIT ONLY WHEN THE TRIGGER AND RELAY CIRCUITS ARE FUNCTIONING NORMALLY, MEANS FORMING A SHORT CIRCUIT PATH FOR SAID RELAY OPERATING CIRCUIT, TRANSISTOR MEANS COUPLED TO SAID RELAY CIRCUIT FOR MAINTIAINING SAID SHORT CIRCUIT PATH INEFFECTIVE IN THE PRESENCE OF THE NARROW PULSE TRAIN IN THE RELAY CIRCUIT AND FOR RENDERING SAID SHORT CIRCUIT EFFECTIVE TO DISABLE THE RELAY WHEN SAID TRANSISTOR MEANS IS DEFECTIVE AND IN THE ABSENCE OF THE NARROW PULSE TRAIN IN SAID RELAY CIRCUIT.
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) | 1967-09-22 | 1968-03-23 | 1968-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-22 | 1972-03-23 | 1972-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-22 | 1976-03-23 | 1976-09-22 | $7700.00 | Window Closed / Lapsed |