US3487888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cabin engine sound suppressor
Assignee: McDonnell Douglas Corp
•
Filing: 1966-08-22
•
Granted: 1970-01-06
•
Expires: 1986-08-22
Abstract
No abstract record available.
Inventors
- 👤 Harold W Adams
- 👤 Robert H Bennett Jr
- 👤 James W Schendel
- 👤 Joseph D Van Dyke Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:04
CPC Classifications
F; F16; F16F; F16F7/00; F16F7/10; F16F7/1005; 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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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-05 | 1973-07-07 | 1974-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-05 | 1977-07-07 | 1978-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-05 | 1981-07-07 | 1982-01-06 | $7700.00 | Window Closed / Lapsed |