US2956198A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Traveling wave tubes
Assignee: AT&T Inc
•
Filing: 1955-06-10
•
Granted: 1960-10-11
•
Expires: 1975-06-10
Abstract
No abstract record available.
Inventors
- 👤 Harry E Elder
- 👤 Hunter L Mcdowell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 13:32
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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US2632130A
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US2801361A
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US2608668A
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US2776389A
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US2707758A
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US2619607A
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US2701321A
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US2805351A
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US2741718A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-10-11 | 1964-04-11 | 1964-10-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-11 | 1968-04-11 | 1968-10-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-11 | 1972-04-11 | 1972-10-11 | $7700.00 | Window Closed / Lapsed |