US2801358A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron discharge devices
Assignee: AT&T Inc
•
Filing: 1951-12-28
•
Granted: 1957-07-30
•
Expires: 1971-12-28
Abstract
No abstract record available.
Inventors
- 👤 George H Robertson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:58
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/34; H01J25/36; H01J25/38; H03; H03D; H03D1/00; H03D1/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1875059A
Cited
US1616914A
Cited
US1700373A
Cited
US1997397A
Cited
US2064469A
Cited
US2575383A
Cited
US2578434A
Cited
US2595698A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-29 | 1961-01-28 | 1961-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-29 | 1965-01-28 | 1965-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-29 | 1969-01-28 | 1969-07-30 | $7700.00 | Window Closed / Lapsed |