US3166702A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed control for induction motor having variable resistance secondary
Assignee: PROVINCIAL ENGINEERING Ltd
•
Filing: 1961-10-02
•
Granted: 1965-01-19
•
Expires: 1981-10-02
Abstract
No abstract record available.
Inventors
- 👤 Horsley Edward Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:24
CPC Classifications
B; B66; B66C; B66C13/00; B66C13/18; B66C13/22; B66C13/23; B66C13/26; B66C2700/00; B66C2700/08; B66C2700/081
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
IN A CONTROL CIRCUIT FOR A WOUNF ROTOR HOISTING DRIVE MOTOR HAVING PRIMARY AND SECONDARY WINDINGS, CONTROL MEANS HAVING A PLURALITY OF POSITIONED INCLUDING AT LEAST ONE HOISTING POSITION AND FIRST AND SECOND LOWERING POSITIONS, MEANS OPERATIVE IN SAID HOISTING POSITION, FOR CONNECTING SAID PRIMARY WINDINGS TO AN A.C. LINE AND FOR CONNECTING RESISTANCE MEANS HAVING A FIRST PREDETERMINED VALUE IN CIRCUIT WITH SAID SECONDARY WINDINGS, MEANS OPERATIVE IN SAID FIRST LOWERING POWITION FOR CONNECTING SAID PRIMARY WINDING TO AN A.C. LINE AND FOR CONNECTING RESISTANCE MEANS HAVING A SECOND PREDETERMINED VALUE IN CIRCUIT WITH SAID SECONDARY WINDINGS, SAID SECOND PREDETERMINED VALUE BEING SUBSTANTIALLY GREATER THAN SAID FIRST PREDETERMINED VALUE, MEANS OPERATIVE IN SAID SECOND LOWERING POSITION FOR CONNECTING SAID PRIMARY WINDINGS TO AN A.C. LINE AND FOR CONNECTING RESISTANCE MEANS HAVING A THIRD PREDETERMINED VALUE IN CIRCUIT WITH SAID SECONDARY
Claim 2
Dependent Claim
141 words
IN A CONTROL CIRCUIT FOR A WOUNF ROTOR HOISTING DRIVE MOTOR HAVING PRIMARY AND SECONDARY WINDINGS, CONTROL MEANS HAVING A PLURALITY OF POSITIONED INCLUDING AT LEAST ONE HOISTING POSITION AND FIRST AND SECOND LOWERING POSITIONS, MEANS OPERATIVE IN SAID HOISTING POSITION, FOR CONNECTING SAID PRIMARY WINDINGS TO AN A.C. LINE AND FOR CONNECTING RESISTANCE MEANS HAVING A FIRST PREDETERMINED VALUE IN CIRCUIT WITH SAID SECONDARY WINDINGS, MEANS OPERATIVE IN SAID FIRST LOWERING POWITION FOR CONNECTING SAID PRIMARY WINDING TO AN A.C. LINE AND FOR CONNECTING RESISTANCE MEANS HAVING A SECOND PREDETERMINED VALUE IN CIRCUIT WITH SAID SECONDARY WINDINGS, SAID SECOND PREDETERMINED VALUE BEING SUBSTANTIALLY GREATER THAN SAID FIRST PREDETERMINED VALUE, MEANS OPERATIVE IN SAID SECOND LOWERING POSITION FOR CONNECTING SAID PRIMARY WINDINGS TO AN A.C. LINE AND FOR CONNECTING RESISTANCE MEANS HAVING A THIRD PREDETERMINED VALUE IN CIRCUIT WITH SAID SECONDARY
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) | 1968-01-19 | 1968-07-20 | 1969-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-01-19 | 1972-07-20 | 1973-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-01-19 | 1976-07-20 | 1977-01-19 | $7700.00 | Window Closed / Lapsed |