Patent US3774120A successfully refreshed from Google Patents.
Patent US3004620A successfully refreshed from Google Patents.
US3004620A
Expired / Lapsed
US
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Acoustic amplifier and musical instrument incorporating same
Assignee: Individual
•
Filing: 1956-07-26
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Granted: 1961-10-17
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Expires: 1976-07-26
Abstract
No abstract record available.
Inventors
- 👤 Baschet Francois Pierr Maurice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:17
CPC Classifications
G; G10; G10H; G10H3/00; G10H3/12; Y; Y10; Y10S; Y10S116/00; Y10S116/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1931885A
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US1776223A
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US1762617A
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US1741934A
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US1760252A
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GB295057A
Cited
US1754686A
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US2139099A
Cited
US2233244A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-16 | 1965-04-17 | 1965-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-16 | 1969-04-17 | 1969-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-16 | 1973-04-17 | 1973-10-17 | $7700.00 | Window Closed / Lapsed |