Patent US2775656A successfully refreshed from Google Patents.
US2775656A
Expired / Lapsed
US
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Electron discharge tube amplifiers
Assignee: EMI Ltd
•
Filing: 1951-09-17
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Granted: 1956-12-25
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Expires: 1971-09-17
Abstract
No abstract record available.
Inventors
- 👤 Hounsfield Godfrey Newbold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:01
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/02; H03G3/04; H03G3/06; H03G3/08; Y; Y10; Y10S; Y10S267/00; Y10S267/01
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2323634A
Cited
DE738775C
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GB526173A
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US2524821A
Cited
US2582603A
Cited
GB645955A
Cited
US2634335A
Cited
US2545788A
Cited
US2657282A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-12-25 | 1960-06-25 | 1960-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-12-25 | 1964-06-25 | 1964-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-12-25 | 1968-06-25 | 1968-12-25 | $7700.00 | Window Closed / Lapsed |