US2409417A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron discharge device
Assignee: EMI Ltd
•
Filing: 1944-05-29
•
Granted: 1946-10-15
•
Expires: 1964-05-29
Abstract
No abstract record available.
Inventors
- 👤 Bull Cabot Seaton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:23
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/78; H01J19/80; H03; H03F; H03F1/00; H03F1/26; H03F1/28
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1949-10-14 | 1950-04-15 | 1950-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1953-10-14 | 1954-04-15 | 1954-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1957-10-14 | 1958-04-15 | 1958-10-15 | $7700.00 | Window Closed / Lapsed |