Patent US3076253A successfully refreshed from Google Patents.
Patent US2533802A successfully refreshed from Google Patents.
US2533802A
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US
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Selective amplifier
Assignee: Cornell Dubilier Electronics Inc
•
Filing: 1945-08-06
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Granted: 1950-12-12
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Expires: 1965-08-06
Abstract
No abstract record available.
Inventors
- 👤 Donald L Hings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:10
CPC Classifications
H; H04; H04B; H04B1/00; H04B1/06; H04B1/16; H04B1/1638
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1890543A
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US2098757A
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US2266658A
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US2186195A
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US2205847A
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US2243401A
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US2258440A
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US2226238A
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US2380389A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-11 | 1954-06-12 | 1954-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-11 | 1958-06-12 | 1958-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-11 | 1962-06-12 | 1962-12-12 | $7700.00 | Window Closed / Lapsed |