Patent US2812468A successfully refreshed from Google Patents.
US2812468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Spatial harmonic traveling wave tube
Assignee: AT&T Inc
•
Filing: 1952-12-30
•
Granted: 1957-11-05
•
Expires: 1972-12-30
Abstract
No abstract record available.
Inventors
- 👤 Sloan D Robertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:56
CPC Classifications
H; H01; H01P; H01P9/00; H01J; H01J23/00; H01J23/16; H01J23/24; H01J25/00; H01J25/34; H01J25/36; H01J25/40
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US2395560A
Cited
US2567748A
Cited
US2604594A
Cited
US2708236A
Cited
US2623121A
Cited
US2647175A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-04 | 1961-05-06 | 1961-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-04 | 1965-05-06 | 1965-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-04 | 1969-05-06 | 1969-11-05 | $7700.00 | Window Closed / Lapsed |