US2492643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron discharge tube
Assignee: GTE Sylvania Inc
•
Filing: 1946-01-14
•
Granted: 1949-12-27
•
Expires: 1966-01-14
Abstract
No abstract record available.
Inventors
- 👤 Ishler Harry Kenneth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:12
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/42; H01J2893/00; H01J2893/0001; H01J2893/0002
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1480219A
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US1542386A
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US1670503A
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US2048225A
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US2048224A
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US2048230A
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US1948122A
Cited
US2038360A
Cited
US2015327A
Cited
GB485798A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-26 | 1953-06-27 | 1953-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-26 | 1957-06-27 | 1957-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-26 | 1961-06-27 | 1961-12-27 | $7700.00 | Window Closed / Lapsed |