Patent US2451249A successfully refreshed from Google Patents.
US2451249A
Expired / Lapsed
US
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Electron discharge device for ultra high frequencies
Assignee: RCA Corp
•
Filing: 1943-03-18
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Granted: 1948-10-12
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Expires: 1963-03-18
Abstract
No abstract record available.
Inventors
- 👤 Philip T Smith
- 👤 Howard R Hegbar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:03
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/78; H01J19/80
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2130280A
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US2130281A
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US2088722A
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US2157952A
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US2167201A
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US2304186A
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US2314794A
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US2358542A
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US2399223A
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US2353743A
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US2353742A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-10-12 | 1952-04-12 | 1952-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-10-12 | 1956-04-12 | 1956-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-10-12 | 1960-04-12 | 1960-10-12 | $7700.00 | Window Closed / Lapsed |