Patent US1573116A successfully refreshed from Google Patents.
US3135906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed control system for electric motor
Assignee: Individual
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Filing: 1962-05-24
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Granted: 1964-06-02
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Expires: 1982-05-24
Abstract
No abstract record available.
Inventors
- 👤 Frank T Pisano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:27
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/292; H02P7/293; Y; Y10; Y10S; Y10S388/00; Y10S388/923; Y10S388/924; Y10S388/926
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
IN A SYSTEM FOR OPERATING A LOAD DEVICE WHICH IS DRIVEN DURING ONE CYCLE OF ITS OPERATION AND GENERATES DRIVING TORQUE DURING ANOTHER CYCLE OF ITS OPERATION, THE COMBINATION THEREWITH OF AN ELECTRIC MOTOR HAVING FIRST AND SECOND OPPOSITELY WOUND FIELD WINDINGS AND AN ARMATURE WINDING HAVING ONE OF ITS TERMINALS CONNECTED TO SAID FIELD WINDINGS AND THE OTHER OF ITS TERMINALS CONNECTED TO A COMMON INPUT LEAD, SEPARATE INPUT LEADS CONNECTED TO SAID FIELD WINDINGS, AN ASYMMETRIC CONDUCTOR CONNECTED IN THE INPUT LEAD TO SAID FIRST FIELD WINDING, CIRCUIT INTERRUPTING MEANS AND A RESISTOR CONNECTED IN SERIES BETWEEN SAID COMMON LEAD AND THE INPUT LEAD TO THE SECOND OF SAID FIELD WINDINGS, A VOLTAGE DIVIDER CONNECTED BETWEEN SAID COMMON LEAD AND THE INPUT LEAD TO THE FIRST OF SAID FIELD WINDINGS, AND MEANS FOR APPLYING FROM SAID VOLTAGE DIVIDER TO SAID CIRCUIT INTERRUPTING MEANS A VOLTAGE WHEREBY CURRENT THROUGH SAID RESISTOR IS INTERRUPTED ONLY WHEN SAID FIRST FIELD WINDING IS DEENERGIZED.
Claim 2
Dependent Claim
162 words
IN A SYSTEM FOR OPERATING A LOAD DEVICE WHICH IS DRIVEN DURING ONE CYCLE OF ITS OPERATION AND GENERATES DRIVING TORQUE DURING ANOTHER CYCLE OF ITS OPERATION, THE COMBINATION THEREWITH OF AN ELECTRIC MOTOR HAVING FIRST AND SECOND OPPOSITELY WOUND FIELD WINDINGS AND AN ARMATURE WINDING HAVING ONE OF ITS TERMINALS CONNECTED TO SAID FIELD WINDINGS AND THE OTHER OF ITS TERMINALS CONNECTED TO A COMMON INPUT LEAD, SEPARATE INPUT LEADS CONNECTED TO SAID FIELD WINDINGS, AN ASYMMETRIC CONDUCTOR CONNECTED IN THE INPUT LEAD TO SAID FIRST FIELD WINDING, CIRCUIT INTERRUPTING MEANS AND A RESISTOR CONNECTED IN SERIES BETWEEN SAID COMMON LEAD AND THE INPUT LEAD TO THE SECOND OF SAID FIELD WINDINGS, A VOLTAGE DIVIDER CONNECTED BETWEEN SAID COMMON LEAD AND THE INPUT LEAD TO THE FIRST OF SAID FIELD WINDINGS, AND MEANS FOR APPLYING FROM SAID VOLTAGE DIVIDER TO SAID CIRCUIT INTERRUPTING MEANS A VOLTAGE WHEREBY CURRENT THROUGH SAID RESISTOR IS INTERRUPTED ONLY WHEN SAID FIRST FIELD WINDING IS DEENERGIZED.
References Cited (Backward Citations)
US2356166A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-06-02 | 1967-12-02 | 1968-06-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-06-02 | 1971-12-02 | 1972-06-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-06-02 | 1975-12-02 | 1976-06-02 | $7700.00 | Window Closed / Lapsed |