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US3490556A
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Aircraft cabin noise reduction system with tuned vibration absorbers
Assignee: McDonnell Douglas Corp
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Filing: 1968-01-15
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Granted: 1970-01-20
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Expires: 1988-01-15
Abstract
No abstract record available.
Inventors
- 👤 Robert H Bennett Jr
- 👤 Joseph D Van Dyke Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:25
CPC Classifications
F; F16; F16F; F16F7/00; F16F7/10; F16F7/104; B; B64; B64C; B64C1/00; B64C1/40; G; G10; G10K; G10K11/00; G10K11/16; G10K11/175
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2038603A
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US2225929A
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US2344735A
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US2510963A
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US2901239A
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US2902273A
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US3101937A
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US3314503A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-19 | 1973-07-21 | 1974-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-19 | 1977-07-21 | 1978-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-19 | 1981-07-21 | 1982-01-20 | $7700.00 | Window Closed / Lapsed |