Patent US2005481A successfully refreshed from Google Patents.
Patent US2811641A successfully refreshed from Google Patents.
US2811641A
Expired / Lapsed
US
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Microwave tube
Assignee: Raytheon Co
•
Filing: 1954-03-31
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Granted: 1957-10-29
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Expires: 1974-03-31
Abstract
No abstract record available.
Inventors
- 👤 Charles K Birdsall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:19
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/34; H01J25/36; H01J25/38; H01J23/00; H01J23/16; H01J23/24; H01J23/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2420559A
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US2653270A
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US2521760A
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US2578434A
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US2660689A
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US2626371A
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FR970096A
Cited
CH278419A
Cited
US2603773A
Cited
US2730649A
Cited
US2704829A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-28 | 1961-04-29 | 1961-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-28 | 1965-04-29 | 1965-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-28 | 1969-04-29 | 1969-10-29 | $7700.00 | Window Closed / Lapsed |