US2830221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Traveling wave tubes
Assignee: RCA Corp
•
Filing: 1951-10-01
•
Granted: 1958-04-08
•
Expires: 1971-10-01
Abstract
No abstract record available.
Inventors
- 👤 Wellesley J Dodds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:04
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/34; H01J25/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1991282A
Cited
US2122538A
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US2295315A
Cited
US2241976A
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US2376707A
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US2439401A
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US2435601A
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US2598301A
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US2575383A
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US2591350A
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US2579654A
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US2542797A
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US2578434A
Cited
US2584308A
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US2565357A
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FR993156A
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US2608668A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-07 | 1961-10-07 | 1962-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-07 | 1965-10-07 | 1966-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-07 | 1969-10-07 | 1970-04-08 | $7700.00 | Window Closed / Lapsed |