US2973453A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Travelling wave tubes
Assignee: MO Valve Co Ltd
•
Filing: 1959-04-22
•
Granted: 1961-02-28
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Expires: 1979-04-22
Abstract
No abstract record available.
Inventors
- 👤 Hogg Harold Alexander Cecil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 19:59
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/34; H01J25/36; H01J25/40; H01J23/00; H01J23/02; H01J23/08; H01J23/083
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2680825A
Cited
US2745983A
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US2823332A
Cited
US2794935A
Cited
GB773709A
Cited
US2911556A
Cited
US2857548A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-28 | 1964-08-29 | 1965-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-28 | 1968-08-29 | 1969-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-28 | 1972-08-29 | 1973-02-28 | $7700.00 | Window Closed / Lapsed |