US2489131A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron discharge device of the cavity resonator type
Assignee: RCA Corp
•
Filing: 1943-11-17
•
Granted: 1949-11-22
•
Expires: 1963-11-17
Abstract
No abstract record available.
Inventors
- 👤 Howard R Hegbar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 20:52
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/08; H01J; H01J23/00; H01J23/36; H01J25/00; H01J25/50; H01J25/52; H01J25/58; H01J25/587
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2247077A
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US2408409A
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US2402184A
Cited
US2404086A
Cited
US2351744A
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US2446825A
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US2408903A
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US2450023A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-21 | 1953-05-23 | 1953-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-21 | 1957-05-23 | 1957-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-21 | 1961-05-23 | 1961-11-22 | $7700.00 | Window Closed / Lapsed |