Patent US2885494A successfully refreshed from Google Patents.
US2885494A
Expired / Lapsed
US
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Temperature compensated transistor amplifier
Assignee: AT&T Inc
•
Filing: 1952-09-26
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Granted: 1959-05-05
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Expires: 1972-09-26
Abstract
No abstract record available.
Inventors
- 👤 Darlington Sidney
- 👤 Jean H Felker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:44
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/34
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2269590A
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US2313096A
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US2401779A
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US2517960A
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US2541322A
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US2531076A
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US2647958A
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US2620448A
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US2757243A
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US2644895A
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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) | 1962-05-04 | 1962-11-03 | 1963-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-05-04 | 1966-11-03 | 1967-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-05-04 | 1970-11-03 | 1971-05-05 | $7700.00 | Window Closed / Lapsed |