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US2500355A
Expired / Lapsed
US
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Electron discharge tube
Assignee: GTE Sylvania Inc
•
Filing: 1944-11-14
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Granted: 1950-03-14
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Expires: 1964-11-14
Abstract
No abstract record available.
Inventors
- 👤 Haas Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:05
CPC Classifications
H; H01; H01J; H01J21/00; H01J21/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1930219A
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US1805626A
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US2091443A
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US2225853A
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US2218254A
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US2310811A
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US2280980A
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US2353743A
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US2353742A
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US2367331A
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US2335818A
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US2421039A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-03-13 | 1953-09-12 | 1954-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-03-13 | 1957-09-12 | 1958-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-03-13 | 1961-09-12 | 1962-03-14 | $7700.00 | Window Closed / Lapsed |