Patent US2572644A successfully refreshed from Google Patents.
US2572644A
Expired / Lapsed
US
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Electron discharge tube
Assignee: EMI Ltd
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Filing: 1948-08-19
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Granted: 1951-10-23
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Expires: 1968-08-19
Abstract
No abstract record available.
Inventors
- 👤 Mcgee James Dwyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:41
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/26; H01J31/28; H01J31/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2140284A
Cited
US2203734A
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US2387608A
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US2294123A
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US2306875A
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US2314409A
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US2460093A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-10-22 | 1955-04-23 | 1955-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-10-22 | 1959-04-23 | 1959-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-10-22 | 1963-04-23 | 1963-10-23 | $7700.00 | Window Closed / Lapsed |