US2807743A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Traveling wave tube apparatus including magnetic structures
Assignee: AT&T Inc
•
Filing: 1951-12-29
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Granted: 1957-09-24
•
Expires: 1971-12-29
Abstract
No abstract record available.
Inventors
- 👤 Paul P Cioffi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:34
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/02; H01J23/08; H01J23/087
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2159534A
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US2259531A
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US2300052A
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US2431077A
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US2455676A
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US2687490A
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US2567674A
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US2608668A
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US2619611A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-23 | 1961-03-25 | 1961-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-23 | 1965-03-25 | 1965-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-23 | 1969-03-25 | 1969-09-24 | $7700.00 | Window Closed / Lapsed |