US2987136A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for reducing noise
Assignee: Power Jets Research and Development Ltd
•
Filing: 1956-03-28
•
Granted: 1961-06-06
•
Expires: 1976-03-28
Abstract
No abstract record available.
Inventors
- 👤 Lilley Geoffrey Michael
- 👤 Green Douglas James
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:13
CPC Classifications
B; B64; B64F; B64F1/00; B64F1/26
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1887305A
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US2047378A
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US2396952A
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US2473103A
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GB638954A
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US2650752A
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US2674335A
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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) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |