US3071699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control circuit
Assignee: Schneider Electric USA Inc
•
Filing: 1959-03-23
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Granted: 1963-01-01
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Expires: 1979-03-23
Abstract
No abstract record available.
Inventors
- 👤 James J Eckl
- 👤 Charles F Meyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:59
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/08; G01V3/10; G01V3/104; G01V3/105; G01V3/107
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
135 words
THE COMBINATION COMPRISING: AN ALTERNATING CURRENT SOURCE INCLUDING A SECONDARY TRANSFORMER WINDING HAVING AN INTERMEDIATE TAP, A MAGNETIC TRANSDUCER CONNECTED ACROSS A PORTION OF THE SECONDARY WINDING INCLUDING THE TAP FOR PRODUCING A VARIABLE MAGNETIC FIELD AND AN ALTERNATING CURRENT VOLTAGE SIGNAL HAVING A PHASE ANGLE WHICH VARIES IN RESPONSE TO DISTURBANCES OF THE MAGNETIC FIELD BY A METAL OBJECT, MEANS CONNECTED ACROSS THE WINDING FOR PROVIDING A SOURCE OF HALF WAVE RECTIFIED ALTERNATING CURRENT PROVIDING SPACED VOLTAGE PULSES, AND MEANS INCLUDING A TRANSISTOR HAVING A BASE AND EMITTER CONNECTED TO BE RESPONSIVE TO THE VOLTAGE SIGNAL AND A COLLECTOR AND THE EMITTER CONNECTED TO RECEIVE THE VOLTAGE PULSES OF THE A.C. SOURCE, SAID TRANSISTOR BEING ARRANGED TO BE RENDERED CONDUCTIVE WHEN THE BASE AND EMITTER HAVE THE SAME POLARITY AS THE COLLECTOR TO EMITTER.
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) | 1965-12-31 | 1966-07-02 | 1967-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-31 | 1970-07-02 | 1971-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-31 | 1974-07-02 | 1975-01-01 | $7700.00 | Window Closed / Lapsed |