US2442848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron control tube
Assignee: Farnsworth Research Corp
•
Filing: 1942-03-09
•
Granted: 1948-06-08
•
Expires: 1962-03-09
Abstract
No abstract record available.
Inventors
- 👤 Bernard C Gardner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:42
CPC Classifications
H; H01; H01J; H01J21/00; H01J21/02; H01J21/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2092893A
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US2061387A
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US2138928A
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US2163787A
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US2157585A
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US2143146A
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US2175697A
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US2221447A
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US2250511A
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US2271985A
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US2284829A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-06-08 | 1951-12-08 | 1952-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-06-08 | 1955-12-08 | 1956-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-06-08 | 1959-12-08 | 1960-06-08 | $7700.00 | Window Closed / Lapsed |