US2825840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Traveling wave electron discharge devices
Assignee: TDK Micronas GmbH
•
Filing: 1953-01-29
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Granted: 1958-03-04
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Expires: 1973-01-29
Abstract
No abstract record available.
Inventors
- 👤 Haig P Iskenderian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:43
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/02; H01J23/08; H01J23/087
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1849085A
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US2200039A
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US2259531A
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US2272766A
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US2300052A
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US2433682A
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US2608668A
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US2707758A
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US2741718A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-03-03 | 1961-09-02 | 1962-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-03-03 | 1965-09-02 | 1966-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-03-03 | 1969-09-02 | 1970-03-04 | $7700.00 | Window Closed / Lapsed |