Patent US3437854A successfully refreshed from Google Patents.
US3437854A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric rotary step motor with plural offset stator windings
Assignee: Fujitsu Ltd
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Filing: 1966-11-04
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Granted: 1969-04-08
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Expires: 1986-11-04
Abstract
No abstract record available.
Inventors
- 👤 Mitsuo Oiso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:39
CPC Classifications
H; H02; H02K; H02K37/00; H02K37/02; H02K37/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
142 words
AN ELECTRIC STEP MOTOR OF LOW INERTIA AND HIGH TORQUE, COMPRISING A ROTATABLY MOUNTED ROTOR HAVING A PERIPHERAL SURFACE AND A PLURALITY OF SPACED TEETH EXTENDING OUTWARDLY FROM SAID PERIPHERAL SURFACE, EACH OF THE TEETH OF SAID ROTOR HAVING A FIRST DETERMINED WIDTH IN A CIRCUMFERENTIAL DIRECTION; A PLURALITY OF FIXEDLY MOUNTED STATOR PORTIONS COAXIALLY POSITIONED AROUND SAID ROTOR EACH HAVING AN INNER CIRCUMFERENTIAL SURFACE AND A PLURALITY OF SPACED TEETH EXTENDING INWARDLY FROM SAID INNER CIRCUMFERENTIAL SURFACE TOWARD THE TEETH OF SAID ROTOR, EACH OF THE TEETH OF EACH OF SAID STATOR PORTIONS HAVING A SECOND DETERMINED WIDTH IN A CIRCUMFERENTIAL DIRECTION WHICH IS LESS THAN HALF SAID FIRST DETERMINED WIDTH; AND AN EXCITATION WINDING PROVIDED IN EACH OF SAID STATOR PORTIONS FOR ROTATING SAID ROTOR STEP BY STEP UPON SIMULTANEOUS AND SUCCESSIVE EXCITATION OF SELECTED ONES OF SAID EXCITATION WINDINGS.
Claim 2
Dependent Claim
142 words
AN ELECTRIC STEP MOTOR OF LOW INERTIA AND HIGH TORQUE, COMPRISING A ROTATABLY MOUNTED ROTOR HAVING A PERIPHERAL SURFACE AND A PLURALITY OF SPACED TEETH EXTENDING OUTWARDLY FROM SAID PERIPHERAL SURFACE, EACH OF THE TEETH OF SAID ROTOR HAVING A FIRST DETERMINED WIDTH IN A CIRCUMFERENTIAL DIRECTION; A PLURALITY OF FIXEDLY MOUNTED STATOR PORTIONS COAXIALLY POSITIONED AROUND SAID ROTOR EACH HAVING AN INNER CIRCUMFERENTIAL SURFACE AND A PLURALITY OF SPACED TEETH EXTENDING INWARDLY FROM SAID INNER CIRCUMFERENTIAL SURFACE TOWARD THE TEETH OF SAID ROTOR, EACH OF THE TEETH OF EACH OF SAID STATOR PORTIONS HAVING A SECOND DETERMINED WIDTH IN A CIRCUMFERENTIAL DIRECTION WHICH IS LESS THAN HALF SAID FIRST DETERMINED WIDTH; AND AN EXCITATION WINDING PROVIDED IN EACH OF SAID STATOR PORTIONS FOR ROTATING SAID ROTOR STEP BY STEP UPON SIMULTANEOUS AND SUCCESSIVE EXCITATION OF SELECTED ONES OF SAID EXCITATION WINDINGS.
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) | 1972-04-07 | 1972-10-07 | 1973-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-07 | 1976-10-07 | 1977-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-07 | 1980-10-07 | 1981-04-08 | $7700.00 | Window Closed / Lapsed |