Patent US3424994A successfully refreshed from Google Patents.
US3424994A
Expired / Lapsed
US
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Signal-to-noise ratio enhancer
Assignee: JEWEL D BROWDER
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Filing: 1965-01-06
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Granted: 1969-01-28
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Expires: 1985-01-06
Abstract
No abstract record available.
Inventors
- 👤 Jewel D Browder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 21:49
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/26; H03F1/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1481284A
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US2112705A
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US2153969A
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US2140526A
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US2266713A
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US2230243A
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US2305842A
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US2373241A
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US3167721A
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US3179819A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-01-28 | 1972-07-29 | 1973-01-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-01-28 | 1976-07-29 | 1977-01-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-01-28 | 1980-07-29 | 1981-01-28 | $7700.00 | Window Closed / Lapsed |