US2788458A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High starting torque induction motor rotor
Assignee: EASTERN AIR DEVICES Inc
•
Filing: 1953-12-09
•
Granted: 1957-04-09
•
Expires: 1973-12-09
Abstract
No abstract record available.
Inventors
- 👤 James M Naul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:30
CPC Classifications
H; H02; H02K; H02K17/00; H02K17/02; H02K17/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US936292A
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US1079332A
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US1437886A
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US1743818A
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US1772719A
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FR698226A
Cited
US2196059A
Cited
US2242006A
Cited
DE740689C
Cited
US2648788A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-08 | 1960-10-08 | 1961-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-08 | 1964-10-08 | 1965-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-08 | 1968-10-08 | 1969-04-09 | $7700.00 | Window Closed / Lapsed |