Patent US2955223A successfully refreshed from Google Patents.
US2955223A
Expired / Lapsed
US
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Traveling wave tube
Assignee: AT&T Inc
•
Filing: 1956-09-12
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Granted: 1960-10-04
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Expires: 1976-09-12
Abstract
No abstract record available.
Inventors
- 👤 Kompfner Rudolf
- 👤 Calvin F Quate
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:47
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/16; H01J23/24; H01J23/26; H01J23/27
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE21739E
Cited
US2647219A
Cited
US2801359A
Cited
US2802135A
Cited
FR1119661A
Cited
US2702370A
Cited
US2882440A
Cited
US2853644A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-04 | 1964-04-04 | 1964-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-04 | 1968-04-04 | 1968-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-04 | 1972-04-04 | 1972-10-04 | $7700.00 | Window Closed / Lapsed |