US3307075A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Overcurrent and undercurrent control circuit
Assignee: Dur Ral Electronics Co Inc
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Filing: 1963-07-19
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Granted: 1967-02-28
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Expires: 1983-07-19
Abstract
No abstract record available.
Inventors
- 👤 Donald M Park
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:12
CPC Classifications
H; H02; H02H; H02H1/00; H02H1/04; H02H7/00; H02H7/08; H02H7/085
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
IN COMBINATION, AN ALTERNATING VOLTAGE LOAD CIRCUIT, MEANS FOR SUPPLYING ALTERNATING VOLTAGE TO THE LOAD CIRCUIT, A LOAD CIRCUIT INTERRUPTER, A RELAY HAVING A COIL OPERATIVE WHEN ENERGIZED TO ACTUATE THE INTERRUPTER, A DIRECT VOLTAGE SUPPLY ENERGIZED FROM SAID ALTERNATING VOLTAGE SUPPLY, A SUBSTANTIALLY LOW IMPEDANCE COIL DISPOSED TO PRODUCE A MAGNETIC FIELD PROPORTIONAL TO A LINE CURRENT IN THE LOAD CIRCUIT, A NORMALLY OPEN MAGNETIC FIELD OPERATED SWITCH DISPOSED TO BE CLOSED BY SOME PREDETERMINED VALUE OF THE LOW IMPEDANCE COIL FIELD, MEANS TO VARY THE INFLUENCE OF SAID LOW IMPEDANCE COIL FIELD ON SAID MAGNETIC FIELD SWITCH, A CAPACITOR CONNECTED TO BE CHARGED BY SAID DIRECT VOLTAGE SUPPLY WHEN SAID SWITCH IS OPEN AND TO BE DISCHARGED THROUGH SAID SWITCH WHEN CLOSED, AN ELECTRON VLAVE HAVING A CONTROL GATE ELECTRODE CONNECTED TO BE ENERGIZED BY CURRENT FROM SAID SWITCH
Claim 2
Dependent Claim
141 words
IN COMBINATION, AN ALTERNATING VOLTAGE LOAD CIRCUIT, MEANS FOR SUPPLYING ALTERNATING VOLTAGE TO THE LOAD CIRCUIT, A LOAD CIRCUIT INTERRUPTER, A RELAY HAVING A COIL OPERATIVE WHEN ENERGIZED TO ACTUATE THE INTERRUPTER, A DIRECT VOLTAGE SUPPLY ENERGIZED FROM SAID ALTERNATING VOLTAGE SUPPLY, A SUBSTANTIALLY LOW IMPEDANCE COIL DISPOSED TO PRODUCE A MAGNETIC FIELD PROPORTIONAL TO A LINE CURRENT IN THE LOAD CIRCUIT, A NORMALLY OPEN MAGNETIC FIELD OPERATED SWITCH DISPOSED TO BE CLOSED BY SOME PREDETERMINED VALUE OF THE LOW IMPEDANCE COIL FIELD, MEANS TO VARY THE INFLUENCE OF SAID LOW IMPEDANCE COIL FIELD ON SAID MAGNETIC FIELD SWITCH, A CAPACITOR CONNECTED TO BE CHARGED BY SAID DIRECT VOLTAGE SUPPLY WHEN SAID SWITCH IS OPEN AND TO BE DISCHARGED THROUGH SAID SWITCH WHEN CLOSED, AN ELECTRON VLAVE HAVING A CONTROL GATE ELECTRODE CONNECTED TO BE ENERGIZED BY CURRENT FROM SAID SWITCH
References Cited (Backward Citations)
US2053445A
Cited
US3105174A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-02-27 | 1970-08-29 | 1971-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-27 | 1974-08-29 | 1975-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-27 | 1978-08-29 | 1979-02-28 | $7700.00 | Window Closed / Lapsed |