US3717780A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dual motor for cassette drive
Assignee: Globe Motors Inc
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Filing: 1971-05-05
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Granted: 1973-02-20
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Expires: 1991-05-05
Abstract
Abstract A DUAL ARMATURE MOTOR PARTICULARLY ADAPTED FOR THE DIRECT DRIVE OF TAPE CASSETTES HAS A PERMANENT MAGNET AND A PAIR OF ARMATURE PLATES WHICH DEFINE A TAPERED AIR GAP AT THE POLE, AND IN WHICH THE ARMATURE IS FORMED WITH WINDING SLOTS WHICH ARE SKEWED AT AN ANGLE TO THE ROTOR AXIS TO ELIMINATE COGGING WHEN THE MOTOR ARMATURES ARE DRIVEN AT LOW SPEED.
Inventors
- 👤 J Hohne
- 👤 C Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:13
CPC Classifications
H; H02; H02K; H02K16/00
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) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |