US3149256A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-starting rotors for synchronous reaction motors
Assignee: Individual
•
Filing: 1960-12-20
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Granted: 1964-09-15
•
Expires: 1980-12-20
Abstract
No abstract record available.
Inventors
- 👤 Kohlhagen Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:59
CPC Classifications
H; H02; H02K; H02K1/00; H02K1/06; H02K1/12; H02K16/00; H02K16/02
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
90 words
A SELF-STARTING ROTOR FOR A SYNCHRONOUS MOTOR WITH CIRCULARLY ARRANGED FIELD POLES, COMPRISING A PERMANENTMAGNET DISC WITH A CENTER AXIS HAVING A CYLINDRICAL PERIPHERY AND POLE FACES FORMED BY SUCCESSIVE AREAS OF OPPOSITE POLARITIES OF SAID PERIPHERY EQUAL IN NUMBER TO THE FIELD POLES AND SUBSTANTIALLY CONTINUOUS WITH EACH OTHER THROUGHOUT SAID PERIPHERY, WITH THE PITCH BETWEEN SAID POLE FACES BEING EQUAL TO THE FIELD POLE PITCH AND THE ADJACENT ENDS OF AT LEAST PART OF THE SUCCESSIVE POLE FACES EXTENDING ALONG LINES OTHER THAN STRAIGHT PARALLEL TO SAID AXIS.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-09-15 | 1968-03-16 | 1968-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-09-15 | 1972-03-16 | 1972-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-09-15 | 1976-03-16 | 1976-09-15 | $7700.00 | Window Closed / Lapsed |