US3457357A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound amplification device for wind instruments
Assignee: Henri Selmer et Cie SA
•
Filing: 1965-10-22
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Granted: 1969-07-22
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Expires: 1985-10-22
Abstract
No abstract record available.
Inventors
- 👤 Jean Selmer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 20:54
CPC Classifications
G; G10; G10D; G10D7/00; G10D7/06; G10D9/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1486081A
Cited
US2486263A
Cited
US2494390A
Cited
US2821879A
Cited
US2984140A
Cited
US3144801A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-07-21 | 1973-01-20 | 1973-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-07-21 | 1977-01-20 | 1977-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-07-21 | 1981-01-20 | 1981-07-22 | $7700.00 | Window Closed / Lapsed |