Patent US3222583A successfully refreshed from Google Patents.
US3222583A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control systems
Assignee: General Electric Co
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Filing: 1962-03-23
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Granted: 1965-12-07
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Expires: 1982-03-23
Abstract
No abstract record available.
Inventors
- 👤 Frank W Gutzwiller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:16
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/292; H02P7/295
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
198 words
A CONTROL CIRCUIT FOR CONTROLLING THE SPEED OF AN ELECTRIC MOTOR HAVING SERIES CONNECTED ARMATURE AND FIELD WINDINGS INCLUDING IN COMBINATION A FIRST PAIR OF TERMINALS FOR CONNECTION TO A SOURCE OF ALTERNATING VOLTAGE; A SECOND PAIR OF TERMINALS FOR CONNECTION TO A MOTOR TO BE CONTROLLED; A SOLID STATE CONTROLLED RECTIFIER HAVING AN ANODE, A CATHODE, AND A GATE CONTROL ELEMENT, SAID RECTIFIER HAVING ITS ANODE AND CATHODE CONNECTED IN A SERIES CIRCUIT WITH SAID SECOND PAIR OF TERMINALS, SAID SERIES CIRCUIT CONNECTED ACROSS SAID FIRST PAIR OF TERMINALS; AND REFERENCE VOLTAGE SUPPLY MEANS INCLUDING A SERIES CIRCUIT HAVING A VARIABLE RESISTANCE ELEMENT AND A RECTIFIER CONNECTED ACROSS SAID FIRST PAIR OF TERMINALS, SAID RECTIFIER ELEMENT POLED TO PASS THE SAME HALF CYCLE OF AN ALTERNATING VOLTAGE SOURCE AS SAID CONTROLLED RECTIFIER ELEMENT, A MOVABLE TAP ON SAID RESISTANCE ELEMENT TO SELECT THE MAGNITUDE OF SAID REFERENCE VOLTAGE, SAID MOVABLE TAP CONNECTED TO SAID GATE CONTROL ELEMENT THROUGH ANOTHER RECTIFIER ELEMENT POLED TO PREVENT CURRENT FLOW FROM SAID GATE CONTROL ELEMENT TO SAID VOLTAGE SOURCE WHEREBY SAID REFERENCE VOLTAGE IS OPPOSED BY MOTOR COUNTERELECTROMOTIVE FORCE DEVELOPED ACROSS SAID SECOND PAIR OF TERMINALS DUE TO RESIDUAL MOTOR FIELD.
Claim 2
Dependent Claim
198 words
A CONTROL CIRCUIT FOR CONTROLLING THE SPEED OF AN ELECTRIC MOTOR HAVING SERIES CONNECTED ARMATURE AND FIELD WINDINGS INCLUDING IN COMBINATION A FIRST PAIR OF TERMINALS FOR CONNECTION TO A SOURCE OF ALTERNATING VOLTAGE; A SECOND PAIR OF TERMINALS FOR CONNECTION TO A MOTOR TO BE CONTROLLED; A SOLID STATE CONTROLLED RECTIFIER HAVING AN ANODE, A CATHODE, AND A GATE CONTROL ELEMENT, SAID RECTIFIER HAVING ITS ANODE AND CATHODE CONNECTED IN A SERIES CIRCUIT WITH SAID SECOND PAIR OF TERMINALS, SAID SERIES CIRCUIT CONNECTED ACROSS SAID FIRST PAIR OF TERMINALS; AND REFERENCE VOLTAGE SUPPLY MEANS INCLUDING A SERIES CIRCUIT HAVING A VARIABLE RESISTANCE ELEMENT AND A RECTIFIER CONNECTED ACROSS SAID FIRST PAIR OF TERMINALS, SAID RECTIFIER ELEMENT POLED TO PASS THE SAME HALF CYCLE OF AN ALTERNATING VOLTAGE SOURCE AS SAID CONTROLLED RECTIFIER ELEMENT, A MOVABLE TAP ON SAID RESISTANCE ELEMENT TO SELECT THE MAGNITUDE OF SAID REFERENCE VOLTAGE, SAID MOVABLE TAP CONNECTED TO SAID GATE CONTROL ELEMENT THROUGH ANOTHER RECTIFIER ELEMENT POLED TO PREVENT CURRENT FLOW FROM SAID GATE CONTROL ELEMENT TO SAID VOLTAGE SOURCE WHEREBY SAID REFERENCE VOLTAGE IS OPPOSED BY MOTOR COUNTERELECTROMOTIVE FORCE DEVELOPED ACROSS SAID SECOND PAIR OF TERMINALS DUE TO RESIDUAL MOTOR FIELD.
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) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |