US2494693A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron discharge device
Assignee: AT&T Inc
•
Filing: 1946-12-24
•
Granted: 1950-01-17
•
Expires: 1966-12-24
Abstract
No abstract record available.
Inventors
- 👤 Sture O Ekstrand
- 👤 Maggs Charles
- 👤 Victor L Ronci
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:42
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/02; H01J25/22; H01J25/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
DE318706C
Cited
GB181812A
Cited
US1474293A
Cited
US2078371A
Cited
US2414785A
Cited
US2412824A
Cited
US2419121A
Cited
US2416714A
Cited
US2421273A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-16 | 1953-07-18 | 1954-01-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-16 | 1957-07-18 | 1958-01-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-16 | 1961-07-18 | 1962-01-17 | $7700.00 | Window Closed / Lapsed |