US3379945A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alternating current electric motors
Assignee: Hoover Co
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Filing: 1964-11-02
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Granted: 1968-04-23
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Expires: 1984-11-02
Abstract
No abstract record available.
Inventors
- 👤 Mitchell John Henry
- 👤 Searle Walter William Ralph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:26
CPC Classifications
H; H02; H02P; H02P5/00; H02P5/74; D; D06; D06F; D06F37/00; D06F37/30; D06F37/304; H02K; H02K16/00; H02P5/747
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
AN ALTERNATING CURRENT ELECTRIC MOTOR ASSEMBLY FOR DRIVING A DRIVEN MEMBER, AT TWO SUBSTANTIALLY DIFFERENT WORKING SPEEDS, INCLUDING TWO MOTORS BOTH COUPLED TO THE DRIVEN MEMBER, WHEREOF ONE, REFERRED TO AS THE HIGHSPEED MOTOR, IS CONSTRUCTED AND COUPLED TO THE DRIVEN MEMBER TO DRIVE IT AT ITS HIGH WORKING SPEED, WHILST THE OTHER IS AN INDUCTION MOTOR CONSTRUCTED AND COUPLED TO THE DRIVEN MEMBER SO THAT ITS SYNCHRONOUS SPEED WILL CORRESPOND TO A SPEED OF THE DRIVEN MEMBER IN THE REGION OF ITS LOWER WORKING SPEED, MEANS FOR ELECTRICALLY CONNECTING THE MOTORS IN SERIES, THE MOTORS BEING SO DESIGNED THAT THE MAXIMUM BRAKING TORQUE EXERTED ON THE DRIVEN MEMBER BY THE INDUCTION MOTOR AT SUPERSYNCHRONOUS SPEEDS, ADDED TO THE MINIMUM LOAD TORQUE, EXCEEDS THE
Claim 2
Dependent Claim
124 words
AN ALTERNATING CURRENT ELECTRIC MOTOR ASSEMBLY FOR DRIVING A DRIVEN MEMBER, AT TWO SUBSTANTIALLY DIFFERENT WORKING SPEEDS, INCLUDING TWO MOTORS BOTH COUPLED TO THE DRIVEN MEMBER, WHEREOF ONE, REFERRED TO AS THE HIGHSPEED MOTOR, IS CONSTRUCTED AND COUPLED TO THE DRIVEN MEMBER TO DRIVE IT AT ITS HIGH WORKING SPEED, WHILST THE OTHER IS AN INDUCTION MOTOR CONSTRUCTED AND COUPLED TO THE DRIVEN MEMBER SO THAT ITS SYNCHRONOUS SPEED WILL CORRESPOND TO A SPEED OF THE DRIVEN MEMBER IN THE REGION OF ITS LOWER WORKING SPEED, MEANS FOR ELECTRICALLY CONNECTING THE MOTORS IN SERIES, THE MOTORS BEING SO DESIGNED THAT THE MAXIMUM BRAKING TORQUE EXERTED ON THE DRIVEN MEMBER BY THE INDUCTION MOTOR AT SUPERSYNCHRONOUS SPEEDS, ADDED TO THE MINIMUM LOAD TORQUE, EXCEEDS THE
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-23 | 1971-10-23 | 1972-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-23 | 1975-10-23 | 1976-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-23 | 1979-10-23 | 1980-04-23 | $7700.00 | Window Closed / Lapsed |