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Patent US2489272A successfully refreshed from Google Patents.
US2489272A
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Stabilized high gain amplifier
Assignee: Individual
•
Filing: 1945-04-09
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Granted: 1949-11-29
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Expires: 1965-04-09
Abstract
No abstract record available.
Inventors
- 👤 Howard L Daniels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:17
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/50; H03F3/52
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1966047A
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US2014102A
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US2178985A
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US2220770A
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US2261356A
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US2282319A
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US2354718A
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US2358480A
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US2379168A
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US2368351A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-28 | 1953-05-30 | 1953-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-28 | 1957-05-30 | 1957-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-28 | 1961-05-30 | 1961-11-29 | $7700.00 | Window Closed / Lapsed |