Patent EP0191571A1 successfully refreshed from Google Patents.
US2456579A
Expired / Lapsed
US
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Electron discharge device for ultra high frequencies
Assignee: RCA Corp
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Filing: 1942-10-30
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Granted: 1948-12-14
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Expires: 1962-10-30
Abstract
No abstract record available.
Inventors
- 👤 Don G Burnside
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:06
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/78; H01J19/80
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2044369A
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US2062334A
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US2062892A
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US2105483A
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US2163247A
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US2267128A
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US2402602A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-12-14 | 1952-06-14 | 1952-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-14 | 1956-06-14 | 1956-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-14 | 1960-06-14 | 1960-12-14 | $7700.00 | Window Closed / Lapsed |