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Patent US3469050A successfully refreshed from Google Patents.
US3469050A
Expired / Lapsed
US
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Arc rotating coil structure in vacuum circuit interrupters
Assignee: English Electric Co Ltd
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Filing: 1966-08-01
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Granted: 1969-09-23
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Expires: 1986-08-01
Abstract
No abstract record available.
Inventors
- 👤 Alfred Alexander Robinson
- 👤 James William Calvesbert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:08
CPC Classifications
H; H01; H01H; H01H33/00; H01H33/60; H01H33/66; H01H33/662; H01H33/664; H01H33/6644; H01H33/6645
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) | 1972-09-22 | 1973-03-24 | 1973-09-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-22 | 1977-03-24 | 1977-09-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-22 | 1981-03-24 | 1981-09-23 | $7700.00 | Window Closed / Lapsed |