Patent US2985790A successfully refreshed from Google Patents.
US2985790A
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US
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Backward wave tube
Assignee: Teledyne UK Ltd
•
Filing: 1952-05-17
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Granted: 1961-05-23
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Expires: 1972-05-17
Abstract
No abstract record available.
Inventors
- 👤 Kompfner Rudolf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:14
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/34; H01J25/36; H01J25/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2603773A
Cited
US2801361A
Cited
US2683238A
Cited
US2708236A
Cited
US2932760A
Cited
US2801359A
Cited
US2880355A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-05-22 | 1964-11-21 | 1965-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-05-22 | 1968-11-21 | 1969-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-05-22 | 1972-11-21 | 1973-05-23 | $7700.00 | Window Closed / Lapsed |