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US2920571A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-magnetic devices
Assignee: English Electric Co Ltd
•
Filing: 1953-05-01
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Granted: 1960-01-12
•
Expires: 1973-05-01
Abstract
No abstract record available.
Inventors
- 👤 Fenemore Alan Stephen
- 👤 Reece Albert Benjamin John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:33
CPC Classifications
H; H02; H02K; H02K44/00; H02K44/02; H02K44/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE543214C
Cited
GB191410948A
Cited
US1298664A
Cited
US2397785A
Cited
US2658452A
Cited
US2558698A
Cited
US2702004A
Cited
GB730943A
Cited
US2764095A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-01-11 | 1963-07-13 | 1964-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-01-11 | 1967-07-13 | 1968-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-01-11 | 1971-07-13 | 1972-01-12 | $7700.00 | Window Closed / Lapsed |