US3189771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Synchronous motor including additional rotor pole to facilitate starting
Assignee: Controls Company of America
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Filing: 1960-10-25
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Granted: 1965-06-15
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Expires: 1980-10-25
Abstract
No abstract record available.
Inventors
- 👤 August J Danck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:52
CPC Classifications
H; H02; H02K; H02K21/00; H02K21/12; H02K21/125; H02K21/02; H02K29/00; H02K29/03; H02K2201/00; H02K2201/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
115 words
A ROTOR FOR A SELF-STARTING SYNCHRONOUS MOTOR HAVING ELECTRO-MAGNETIC CIRCUIT ELEMENTS OF OPPOSITE POLARITY COMPRISING, A ROTATABLE PERMANENT MAGNET MEMBER HAVING A NULL POSITION AND A GENERALLY PLANAR FACE, A FERROUS METAL ARM POSITIONED OPERATIVELY ADJACENT SAID PLANAR FACE AND INCLUDING A POLE ROTATABLE IN THE PATH OF THE PERIPHERY OF SAID MAGNET MEMBER, A PROJECTION ON ONE OF SAID PLANAR FACES AND METAL ARM AND A SLOT ON THE OTHER FOR RECEIPT OF SAID PROJECTION, SAID PROJECTION AND SLOT ARRANGED TO HOLD SAID FERROUS ARM IN A MAGNETICALLY NEUTRAL POSITION WITH RESPECT TO SAID ROTATABLE PERMENANT MAGNET MEMBER TO INITIATE ROTATION OF SAID ROTATABLE PERMANENT MAGNET MEMBER WHEN IT IS IN A NULL POSITION.
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) | 1968-06-14 | 1968-12-14 | 1969-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-14 | 1972-12-14 | 1973-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-14 | 1976-12-14 | 1977-06-15 | $7700.00 | Window Closed / Lapsed |