US2489277A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flexible acoustic tube
Assignee: United States, WAR, Secretary of
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Filing: 1945-09-12
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Granted: 1949-11-29
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Expires: 1965-09-12
Abstract
No abstract record available.
Inventors
- 👤 Raoul A Faralla
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:29
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/10; H04R1/1016; H04R2460/00; H04R2460/15; H04R2499/00; H04R2499/10; H04R2499/11
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-28 | 1953-05-30 | 1953-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-28 | 1957-05-30 | 1957-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-28 | 1961-05-30 | 1961-11-29 | $7700.00 | Window Closed / Lapsed |