US2660690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Traveling wave tube
Assignee: GTE Sylvania Inc
•
Filing: 1948-10-15
•
Granted: 1953-11-24
•
Expires: 1968-10-15
Abstract
No abstract record available.
Inventors
- 👤 Francis C Breeden
- 👤 Leo C Eisaman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:10
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/16; H01J23/24; H01J23/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2005021A
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US1957538A
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US2064469A
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US2300052A
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US2409913A
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US2413608A
Cited
US2602148A
Cited
US2541843A
Cited
US2516944A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-23 | 1957-05-25 | 1957-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-23 | 1961-05-25 | 1961-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-23 | 1965-05-25 | 1965-11-24 | $7700.00 | Window Closed / Lapsed |