US2945979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Traveling wave tube structure
Assignee: AT&T Inc
•
Filing: 1952-12-30
•
Granted: 1960-07-19
•
Expires: 1972-12-30
Abstract
No abstract record available.
Inventors
- 👤 Karp Arthur
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:32
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/16; H01J23/24
Claims Analysis
Total Claims: 0
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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) | 1963-07-19 | 1964-01-18 | 1964-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-19 | 1968-01-18 | 1968-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-19 | 1972-01-18 | 1972-07-19 | $7700.00 | Window Closed / Lapsed |