Patent US2907942A successfully refreshed from Google Patents.
US2907942A
Expired / Lapsed
US
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Frequency responsive electric circuit arrangements and control systems
Assignee: English Electric Co Ltd
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Filing: 1957-06-03
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Granted: 1959-10-06
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Expires: 1977-06-03
Abstract
No abstract record available.
Inventors
- 👤 Law Hilton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 22:48
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/38; H03H7/40; H02; H02P; H02P9/00; H02P9/44; H03J; H03J3/00; H03J2200/00; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/922
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) | 1962-10-05 | 1963-04-06 | 1963-10-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-05 | 1967-04-06 | 1967-10-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-05 | 1971-04-06 | 1971-10-06 | $7700.00 | Window Closed / Lapsed |