US2663818A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron discharge device
Assignee: AT&T Inc
•
Filing: 1951-06-15
•
Granted: 1953-12-22
•
Expires: 1971-06-15
Abstract
No abstract record available.
Inventors
- 👤 Edward J Walsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:25
CPC Classifications
H; H01; H01J; H01J21/00; H01J21/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1273630A
Cited
US2413006A
Cited
US2380525A
Cited
US2519445A
Cited
US2419757A
Cited
US2503806A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-12-21 | 1957-06-22 | 1957-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-12-21 | 1961-06-22 | 1961-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-12-21 | 1965-06-22 | 1965-12-22 | $7700.00 | Window Closed / Lapsed |