Patent US2908845A successfully refreshed from Google Patents.
US2908845A
Expired / Lapsed
US
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High frequency amplifier
Assignee: AT&T Inc
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Filing: 1955-04-22
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Granted: 1959-10-13
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Expires: 1975-04-22
Abstract
No abstract record available.
Inventors
- 👤 John R Pierce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:13
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2416168A
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US2509374A
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US2782339A
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US2684453A
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US2657329A
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US2556881A
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US2776389A
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US2824256A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-10-12 | 1963-04-13 | 1963-10-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-12 | 1967-04-13 | 1967-10-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-12 | 1971-04-13 | 1971-10-13 | $7700.00 | Window Closed / Lapsed |