Patent US2740847A successfully refreshed from Google Patents.
US2740847A
Expired / Lapsed
US
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Apparatus for controlling amplifier tubes
Assignee: Consolidated Electric Corp
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Filing: 1951-03-07
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Granted: 1956-04-03
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Expires: 1971-03-07
Abstract
No abstract record available.
Inventors
- 👤 Bernard S Cahill
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:34
CPC Classifications
G; G01; G01R; G01R31/00; G01R31/24; G01R31/25
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2353876A
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US2490167A
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US2475188A
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US2473265A
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US2533253A
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US2507145A
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US2531458A
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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) | 1959-04-03 | 1959-10-03 | 1960-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-04-03 | 1963-10-03 | 1964-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-04-03 | 1967-10-03 | 1968-04-03 | $7700.00 | Window Closed / Lapsed |