US2790105A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Traveling wave tubes
Assignee: AT&T Inc
•
Filing: 1951-11-01
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Granted: 1957-04-23
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Expires: 1971-11-01
Abstract
No abstract record available.
Inventors
- 👤 Marion E Hines
- 👤 Philip J Rice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:55
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/02; H01J23/06; H01J23/065; H01J25/00; H01J25/34; H01J25/36; H01J25/38
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB378681A
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GB461450A
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US2575383A
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US2602148A
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US2580007A
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US2632130A
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US2611102A
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US2608668A
Cited
US2619611A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-22 | 1960-10-22 | 1961-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-22 | 1964-10-22 | 1965-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-22 | 1968-10-22 | 1969-04-23 | $7700.00 | Window Closed / Lapsed |