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US2620450A
Expired / Lapsed
US
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Synchronous electric motor
Assignee: Individual
•
Filing: 1949-12-07
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Granted: 1952-12-02
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Expires: 1969-12-07
Abstract
No abstract record available.
Inventors
- 👤 Midgley Albert Henry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:05
CPC Classifications
H; H02; H02K; H02K19/00; H02K19/02; H02K19/04; H02K19/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1957275A
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US1933591A
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US1933440A
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US2080371A
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US2140365A
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GB493928A
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US2292265A
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US2455134A
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US2460358A
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US2583180A
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US2531518A
Cited
US2537093A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-02 | 1956-06-02 | 1956-12-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-02 | 1960-06-02 | 1960-12-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-02 | 1964-06-02 | 1964-12-02 | $7700.00 | Window Closed / Lapsed |