Patent US2994834A successfully refreshed from Google Patents.
US2994834A
Expired / Lapsed
US
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Transistor amplifiers
Assignee: BALDWIN PIANO Co
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Filing: 1956-02-29
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Granted: 1961-08-01
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Expires: 1976-02-29
Abstract
No abstract record available.
Inventors
- 👤 Edward M Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:53
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/34; H10; H10D; H10D84/00; H10D84/01; H10D84/0112; H10D84/02; H10D84/03; H10D84/038; H10D84/60; H10D84/611; H10D84/613; H10D84/617; H10D84/67; H10D84/673
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2666818A
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US2667607A
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US2663830A
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US2791644A
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US2762875A
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US2721965A
Cited
US2689930A
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US2751550A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-07-31 | 1965-01-30 | 1965-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-07-31 | 1969-01-30 | 1969-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-07-31 | 1973-01-30 | 1973-08-01 | $7700.00 | Window Closed / Lapsed |