US2908844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low noise traveling wave tubes
Assignee: AT&T Inc
•
Filing: 1951-04-11
•
Granted: 1959-10-13
•
Expires: 1971-04-11
Abstract
No abstract record available.
Inventors
- 👤 Calvin F Quate
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:21
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/02; H01J23/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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FR969886A
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US2584597A
Cited
US2595698A
Cited
US2720610A
Cited
US2767259A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-12 | 1963-04-13 | 1963-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-12 | 1967-04-13 | 1967-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-12 | 1971-04-13 | 1971-10-13 | $7700.00 | Window Closed / Lapsed |