Patent US3287620A successfully refreshed from Google Patents.
US3287620A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chopper circuit
Assignee: ESTERLINE ANGUS INSTR Co
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Filing: 1962-06-13
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Granted: 1966-11-22
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Expires: 1982-06-13
Abstract
No abstract record available.
Inventors
- 👤 Alfons A Tuszynski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:15
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/51; H03K17/56; H03K17/60
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
156 words
IN A CHOPPER HAVING A PAIR OF CONDUCTORS ADAPTED FOR CONNECTION TO A D.C. SIGNAL SOURCE, A POTENTIOMETER HAVING A MOVABLE TAP CONNECTED TO ONE OF SAID CONDUCTORS AND HAVING A RESISTIVE PORTION, A.C. OUTPUT LOAD MEANS CONNECTED TO SAID MOVABLE TAP, SEMICONDUCTOR SWITCHING MEANS CONNECTING THE OPPOSITE ENDS OF SAID RESISTIVE PORTION TO THE OTHER CONDUCTOR ONLY WHEN SAID SWITCHING MEANS IS CLOSED, AND MEANS FOR ALTERNATELY OPENING AND CLOSING SAID SWITCHING MEANS, SAID SEMICONDUCTOR SWITCHING MEANS BEING EFFECTIVE, WHEN CLOSED, TO APPLY VOLTAGES OF OPPOSITE POLARITY TO THE OPPOSITE ENDS OF SAID RESISTIVE PORTION WHEREBY SAID MOVABLE TAP MAY BE POSITIONED AT A POINT ON SAID RESISTIVE PORTION WHICH IS AT ZERO POTENTIAL WHEN SAID SEMICONDUCTOR SWITCHING MEANS IS CONDUCTING, SAID A.C. OUTPUT MEANS BEING CONNECTED TO SAID TAP IN SUCH A MANNER AS TO BE RESPONSIVE TO CHANGES OF CURRENT FLOW THROUGH SAID MOVABLE TAP IN RESPONSE TO OPERATION OF SAID SWITCHING MEANS.
Claim 2
Dependent Claim
156 words
IN A CHOPPER HAVING A PAIR OF CONDUCTORS ADAPTED FOR CONNECTION TO A D.C. SIGNAL SOURCE, A POTENTIOMETER HAVING A MOVABLE TAP CONNECTED TO ONE OF SAID CONDUCTORS AND HAVING A RESISTIVE PORTION, A.C. OUTPUT LOAD MEANS CONNECTED TO SAID MOVABLE TAP, SEMICONDUCTOR SWITCHING MEANS CONNECTING THE OPPOSITE ENDS OF SAID RESISTIVE PORTION TO THE OTHER CONDUCTOR ONLY WHEN SAID SWITCHING MEANS IS CLOSED, AND MEANS FOR ALTERNATELY OPENING AND CLOSING SAID SWITCHING MEANS, SAID SEMICONDUCTOR SWITCHING MEANS BEING EFFECTIVE, WHEN CLOSED, TO APPLY VOLTAGES OF OPPOSITE POLARITY TO THE OPPOSITE ENDS OF SAID RESISTIVE PORTION WHEREBY SAID MOVABLE TAP MAY BE POSITIONED AT A POINT ON SAID RESISTIVE PORTION WHICH IS AT ZERO POTENTIAL WHEN SAID SEMICONDUCTOR SWITCHING MEANS IS CONDUCTING, SAID A.C. OUTPUT MEANS BEING CONNECTED TO SAID TAP IN SUCH A MANNER AS TO BE RESPONSIVE TO CHANGES OF CURRENT FLOW THROUGH SAID MOVABLE TAP IN RESPONSE TO OPERATION OF SAID SWITCHING MEANS.
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) | 1969-11-21 | 1970-05-23 | 1970-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-21 | 1974-05-23 | 1974-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-21 | 1978-05-23 | 1978-11-22 | $7700.00 | Window Closed / Lapsed |