US2439173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron discharge device
Assignee: RCA Corp
•
Filing: 1943-08-12
•
Granted: 1948-04-06
•
Expires: 1963-08-12
Abstract
No abstract record available.
Inventors
- 👤 David B Langmuir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:52
CPC Classifications
H; H01; H01J; H01J21/00; H01J21/02; H01J21/06; H01J21/065
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1118380A
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US1097552A
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US1264270A
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US1353976A
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US1591432A
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US1817762A
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US1580855A
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US2006904A
Cited
US2086578A
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US2108539A
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US2228939A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-06 | 1951-10-06 | 1952-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-06 | 1955-10-06 | 1956-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-06 | 1959-10-06 | 1960-04-06 | $7700.00 | Window Closed / Lapsed |