Patent US2423819A successfully refreshed from Google Patents.
US2423819A
Expired / Lapsed
US
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Vacuum tube with coupling-feedback electrode arrangement
Assignee: Individual
•
Filing: 1943-01-30
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Granted: 1947-07-08
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Expires: 1963-01-30
Abstract
No abstract record available.
Inventors
- 👤 Chevigny Paul Georges
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:21
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)
US1353976A
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US1550768A
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US2020424A
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US2167201A
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US2242249A
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US2310936A
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US2345794A
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US2324766A
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US2398829A
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US2397854A
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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) | 1950-07-07 | 1951-01-06 | 1951-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-07-07 | 1955-01-06 | 1955-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-07-07 | 1959-01-06 | 1959-07-08 | $7700.00 | Window Closed / Lapsed |