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US2858472A
Expired / Lapsed
US
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Slow-wave circuit for a traveling wave tube
Assignee: AT&T Inc
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Filing: 1953-10-16
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Granted: 1958-10-28
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Expires: 1973-10-16
Abstract
No abstract record available.
Inventors
- 👤 Karp Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:04
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/16; H01J23/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2547503A
Cited
US2653270A
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US2643353A
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US2683238A
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US2640951A
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US2645737A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-27 | 1962-04-28 | 1962-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-27 | 1966-04-28 | 1966-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-27 | 1970-04-28 | 1970-10-28 | $7700.00 | Window Closed / Lapsed |