Patent US2855538A successfully refreshed from Google Patents.
US2855538A
Expired / Lapsed
US
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Amplifier tube
Assignee: Teledyne UK Ltd
•
Filing: 1953-03-11
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Granted: 1958-10-07
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Expires: 1973-03-11
Abstract
No abstract record available.
Inventors
- 👤 Thonemann Peter Clive
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 15:07
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/02; H01J25/10; H01J25/16; H01J25/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2367295A
Cited
US2411953A
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US2471037A
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US2457524A
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US2509374A
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US2657329A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-10-06 | 1962-04-07 | 1962-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-06 | 1966-04-07 | 1966-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-06 | 1970-04-07 | 1970-10-07 | $7700.00 | Window Closed / Lapsed |