US2808533A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron discharge devices
Assignee: AT&T Inc
•
Filing: 1952-02-08
•
Granted: 1957-10-01
•
Expires: 1972-02-08
Abstract
No abstract record available.
Inventors
- 👤 George H Robertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:18
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/36; H01J23/40; H01J23/48; H01J23/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2526399A
Cited
US2490845A
Cited
US2578434A
Cited
US2516944A
Cited
US2643353A
Cited
US2701322A
Cited
US2680825A
Cited
US2645737A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-09-30 | 1961-04-01 | 1961-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-30 | 1965-04-01 | 1965-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-30 | 1969-04-01 | 1969-10-01 | $7700.00 | Window Closed / Lapsed |