US3159244A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric motor control
Assignee: American Radiator and Standard Sanitary Corp
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Filing: 1962-11-06
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Granted: 1964-12-01
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Expires: 1982-11-06
Abstract
No abstract record available.
Inventors
- 👤 Maynard E Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:49
CPC Classifications
H; H02; H02K; H02K19/00; H02K19/02; H02K19/10; H02K19/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
123 words
IN AN OPERATOR WHICH COMPRISES A RECIPROCABLE DRIVEN MEMBER, AN A.C. SYNCHRONOUS MOTOR HAVING A FIELD AND A MAGNETIZABLE ROTOR FOR DRIVING SAID MEMBER IN ONE DIRECTION, AND A SPRING FOR DRIVING SAID MEMBER IN THE OTHER DIRECTION; THE IMPROVEMENT COMPRISING A CONTROL CIRCUIT FOR THE MOTOR WHICH INCLUDES MEANS OPERABLE AT ONE TIME FOR APPLYING A RELATIVELY HIGH A.C. VOLTAGE TO THE MOTOR FIELD SUFFICIENT TO OPERATE THE ROTOR AND DRIVEN MEMBER IN SAID ONE DIRECTION AGAINST THE OPPOSITION OF THE SPRING, AND OPERABLE AT A SECOND TIME FOR APPLYING A RELATIVELY LOW A.C. VOLTAGE TO THE MOTOR FIELD TO EXERT A DEMAGNETIZING ACTION ON THE ROTOR SUCH AS TO ENABLE THE SPRING TO DRIVE THE AFOREMENTIONED MEMBER IN ITS OTHER DIRECTION.
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) | 1967-12-01 | 1968-06-01 | 1968-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-01 | 1972-06-01 | 1972-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-01 | 1976-06-01 | 1976-12-01 | $7700.00 | Window Closed / Lapsed |