Patent US2474647A successfully refreshed from Google Patents.
US2474647A
Expired / Lapsed
US
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Speed control of dynamoelectric machines
Assignee: English Electric Co Ltd
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Filing: 1948-01-29
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Granted: 1949-06-28
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Expires: 1968-01-29
Abstract
No abstract record available.
Inventors
- 👤 Binney Eric Alton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:27
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02K; H02K23/00; H02K23/26; H02K23/36; Y; Y10; Y10S; Y10S388/00; Y10S388/923; Y10S388/93; Y10S388/931
Claims Analysis
Total Claims: 0
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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) | 1952-06-27 | 1952-12-27 | 1953-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-06-27 | 1956-12-27 | 1957-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-06-27 | 1960-12-27 | 1961-06-28 | $7700.00 | Window Closed / Lapsed |