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Patent US2798981A successfully refreshed from Google Patents.
US2798981A
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Traveling wave electron discharge devices
Assignee: TDK Micronas GmbH
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Filing: 1952-08-19
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Granted: 1957-07-09
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Expires: 1972-08-19
Abstract
No abstract record available.
Inventors
- 👤 John H Bryant
- 👤 Herbert W Cole
- 👤 Alexander W Mcewan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:49
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/34; H01J25/36; H01J25/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1957538A
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US2157952A
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US2144222A
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US2636948A
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US2602148A
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USRE23647E
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US2701322A
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US2608668A
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US2672571A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-08 | 1961-01-07 | 1961-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-08 | 1965-01-07 | 1965-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-08 | 1969-01-07 | 1969-07-09 | $7700.00 | Window Closed / Lapsed |