Patent US3559014A successfully refreshed from Google Patents.
US3559014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single sensor brushless d.c. motor
Assignee: Litton Marine Systems Inc
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Filing: 1969-08-13
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Granted: 1971-01-26
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Expires: 1989-08-13
Abstract
Abstract A BRUSHLESS D. C. MOTOR CONTAINS A PAIR OF DIAMETRICALLY OPPOSED STATOR WINDINGS AND A PERMANENT MAGNET ROTOR ROTATABLE THEREBETWEEN. A SHUTTER MOUNTED ON THE ROTOR SHAFT, INTERRUPTS THE PASSAGE OF LIGHT BETWEEN A SOURCE AND THE SENSOR DURING ALTERNATE HALF CYCLES OF THE ROTOR REVOLUTION. A STEERING CIRCUIT DIRECTS CURRENT FLOW TO ONE STATOR WINDING WHEN THE SENSOR IS ILLUMINATED AND TO THE OTHER STATOR WINDING WHEN THE SENSOR IS DARK. AMPLIFYING MEANS IN THE STEERING CIRCUIT ARE ELECTRICALLY ENERGIZED THROUGH THE LIGHT SOURCE.
Inventors
- 👤 Rodney G Rakes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:18
CPC Classifications
H; H02; H02P; H02P6/00; H02P6/14; H02K; H02K29/00; H02K29/06; H02K29/10
Claims Analysis
Total Claims: 0
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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) | 1974-01-25 | 1974-07-27 | 1975-01-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-25 | 1978-07-27 | 1979-01-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-25 | 1982-07-27 | 1983-01-26 | $7700.00 | Window Closed / Lapsed |