Patent US4456831A successfully refreshed from Google Patents.
US2828443A
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US
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Electron discharge devices
Assignee: Raytheon Co
•
Filing: 1951-07-28
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Granted: 1958-03-25
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Expires: 1971-07-28
Abstract
No abstract record available.
Inventors
- 👤 Edward C Dench
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 23:50
CPC Classifications
H; H03; H03C; H03C1/00; H03C1/28; H03C1/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1816682A
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US2217745A
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US2416298A
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US2412372A
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US2462137A
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US2582185A
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US2531972A
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US2673306A
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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) | 1961-03-24 | 1961-09-23 | 1962-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-24 | 1965-09-23 | 1966-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-24 | 1969-09-23 | 1970-03-25 | $7700.00 | Window Closed / Lapsed |