Patent US2764750A successfully refreshed from Google Patents.
US2225447A
Expired / Lapsed
US
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Electron discharge device
Assignee: RCA Corp
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Filing: 1939-09-13
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Granted: 1940-12-17
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Expires: 1959-09-13
Abstract
No abstract record available.
Inventors
- 👤 Andrew V Haeff
- 👤 Lloyd P Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:05
CPC Classifications
H; H01; H01J; H01J23/00; H01J23/02; H01J23/10; H01J25/00; H01J25/02; H01J25/04
Claims Analysis
Total Claims: 0
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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) | 1943-12-17 | 1944-06-17 | 1944-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-12-17 | 1948-06-17 | 1948-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-12-17 | 1952-06-17 | 1952-12-17 | $7700.00 | Window Closed / Lapsed |