Patent US2089044A successfully refreshed from Google Patents.
US2089044A
Expired / Lapsed
US
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Electron discharge tube
Assignee: RCA Corp
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Filing: 1936-05-16
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Granted: 1937-08-03
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Expires: 1956-05-16
Abstract
No abstract record available.
Inventors
- 👤 Adolph A Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:51
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/40; H01J5/00; H01J5/20; H01J5/22; H01J5/26; H01J9/24; H01J9/34; H01J2893/00; H01J2893/0033; H01J2893/0037; H01J2893/0041; H01J2893/0043
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) | 1940-08-02 | 1941-02-01 | 1941-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1944-08-02 | 1945-02-01 | 1945-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1948-08-02 | 1949-02-01 | 1949-08-03 | $7700.00 | Window Closed / Lapsed |