Patent US3390307A successfully refreshed from Google Patents.
US3390307A
Expired / Lapsed
US
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Electrical relays
Assignee: English Electric Co Ltd
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Filing: 1965-08-30
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Granted: 1968-06-25
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Expires: 1985-08-30
Abstract
No abstract record available.
Inventors
- 👤 Paddison Eric
- 👤 Clegg David
- 👤 Warren Robin Howard John
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 17:20
CPC Classifications
H; H02; H02H; H02H3/00; H02H3/40; H02H1/00; H02H1/04; H02H1/06; H02H1/063; H02J; H02J9/00; H02J9/04; H02J9/06; H02J9/061
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) | 1971-06-25 | 1971-12-25 | 1972-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-25 | 1975-12-25 | 1976-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-25 | 1979-12-25 | 1980-06-25 | $7700.00 | Window Closed / Lapsed |