Patent US2739189A successfully refreshed from Google Patents.
US2739189A
Expired / Lapsed
US
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Grounded grid u. h. f. amplifier with gain control and constant input impedance
Assignee: RCA Corp
•
Filing: 1950-07-12
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Granted: 1956-03-20
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Expires: 1970-07-12
Abstract
No abstract record available.
Inventors
- 👤 Koch Winfield Rudolph
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:19
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/08; H03G; H03G3/00; H03G3/20; H03G3/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB485854A
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US2247316A
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US2233782A
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US2276565A
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US2284102A
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US2363985A
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US2256085A
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US2318075A
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US2519359A
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US2460907A
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US2546837A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-20 | 1959-09-19 | 1960-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-20 | 1963-09-19 | 1964-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-20 | 1967-09-19 | 1968-03-20 | $7700.00 | Window Closed / Lapsed |