US2898507A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric travelling wave amplifiers
Assignee: MO Valve Co Ltd
•
Filing: 1954-08-13
•
Granted: 1959-08-04
•
Expires: 1974-08-13
Abstract
No abstract record available.
Inventors
- 👤 Graham Morley Clarke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:41
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/16; H01J23/24; H01J23/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2122538A
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US2637775A
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US2789247A
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US2761088A
Cited
GB668017A
Cited
US2725499A
Cited
US2768322A
Cited
US2774005A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-08-03 | 1963-02-02 | 1963-08-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-08-03 | 1967-02-02 | 1967-08-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-08-03 | 1971-02-02 | 1971-08-04 | $7700.00 | Window Closed / Lapsed |