US2809321A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Traveling-wave tube
Assignee: Raytheon Co
•
Filing: 1953-12-30
•
Granted: 1957-10-08
•
Expires: 1973-12-30
Abstract
No abstract record available.
Inventors
- 👤 Horace R Johnson
- 👤 Dean A Watkins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:49
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)
US2575383A
Cited
US2660689A
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US2654047A
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US2720609A
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US2626371A
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US2773213A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-07 | 1961-04-08 | 1961-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-07 | 1965-04-08 | 1965-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-07 | 1969-04-08 | 1969-10-08 | $7700.00 | Window Closed / Lapsed |