Patent US3621749A successfully refreshed from Google Patents.
US3621749A
Expired / Lapsed
US
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Sound projector horn and single head drum combination
Assignee: Individual
•
Filing: 1970-06-18
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Granted: 1971-11-23
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Expires: 1990-06-18
Abstract
Abstract A DRUM HAVING A TUBULAR-LIKE SHELL WITH A VIBRATABLE HEAD OVER AN OPEN END THEREOF AND HAVING ANOTHER OPEN END WITH A SOUND PROJECTING HORN THEREON.
Inventors
- 👤 Alan Lee Aluisi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:36
CPC Classifications
G; G10; G10D; G10D13/00; G10D13/10; G10D13/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |