Patent US3061804A successfully refreshed from Google Patents.
US3061804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Audio transformer
Assignee: BALDWIN PIANO Co
•
Filing: 1956-02-01
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Granted: 1962-10-30
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Expires: 1976-02-01
Abstract
No abstract record available.
Inventors
- 👤 Alexander B Bereskin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:20
CPC Classifications
H; H01; H01F; H01F19/00; H01F19/02
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1253166A
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US1362138A
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US1320980A
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US2310684A
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GB617660A
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US2430738A
Cited
US2654058A
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US2550891A
Cited
GB689488A
Cited
US2710380A
Cited
US2791646A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-10-29 | 1966-04-30 | 1966-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-29 | 1970-04-30 | 1970-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-29 | 1974-04-30 | 1974-10-30 | $7700.00 | Window Closed / Lapsed |