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US3299335A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-starting direct-current motors having no commutator
Assignee: US Philips Corp
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Filing: 1964-03-10
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Granted: 1967-01-17
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Expires: 1984-03-10
Abstract
No abstract record available.
Inventors
- 👤 Wessels Johannes Hendrik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:26
CPC Classifications
H; H02; H02K; H02K29/00; H02K29/06; H02K29/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
A DIRECT CURRENT MOTOR COMPRISING A PERMANENT MAGNET ROTOR, A SOURCE OF SUPPLY VOLTAGE, A STATOR HAVING AT LEAST TWO GROUPS OF COILS, EACH OF SAID GROUPS COMPRISING AT LEAST ONE WINDING, AND CONTEOL MEANS FOR SELECTIVELY, INTERCONNECTING SAID VOLTAGE SOURCE WITH SAID GROUPS OF COILS TO EFFECT ROTATION OF THE MOTOR, SAID CONTROL MEANS BEING CONTROLLED BY THE POSITION OF THE ROTOR SO THAT FOR EACH POSITION THEREOF AT LEAST ONE GROUP OF STATOR COILS IS ENERGIZED FROM SAID VOLTAGE SOURCE, SAID ROTOR COMPRISING A PLURALITY OF RADIALLY MAGNETIZED PERMANENT MAGNET MEMBERS ANGULARLY SPACED ABOUT THE ROTOR CIRCUMFERENCE IN PAIRS AND A PLURALITY OF ANGULARLY SPACED NON-MAGNETIC MEMBERS EACH OF WHICH IS INTERPOSED BETWEEN SUCCESSIVE
Claim 2
Dependent Claim
116 words
A DIRECT CURRENT MOTOR COMPRISING A PERMANENT MAGNET ROTOR, A SOURCE OF SUPPLY VOLTAGE, A STATOR HAVING AT LEAST TWO GROUPS OF COILS, EACH OF SAID GROUPS COMPRISING AT LEAST ONE WINDING, AND CONTEOL MEANS FOR SELECTIVELY, INTERCONNECTING SAID VOLTAGE SOURCE WITH SAID GROUPS OF COILS TO EFFECT ROTATION OF THE MOTOR, SAID CONTROL MEANS BEING CONTROLLED BY THE POSITION OF THE ROTOR SO THAT FOR EACH POSITION THEREOF AT LEAST ONE GROUP OF STATOR COILS IS ENERGIZED FROM SAID VOLTAGE SOURCE, SAID ROTOR COMPRISING A PLURALITY OF RADIALLY MAGNETIZED PERMANENT MAGNET MEMBERS ANGULARLY SPACED ABOUT THE ROTOR CIRCUMFERENCE IN PAIRS AND A PLURALITY OF ANGULARLY SPACED NON-MAGNETIC MEMBERS EACH OF WHICH IS INTERPOSED BETWEEN SUCCESSIVE
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) | 1970-01-16 | 1970-07-18 | 1971-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-16 | 1974-07-18 | 1975-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-16 | 1978-07-18 | 1979-01-17 | $7700.00 | Window Closed / Lapsed |