Patent US3286786A successfully refreshed from Google Patents.
US3286786A
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Gas turbine exhaust silencer and acoustical material therefor
Assignee: Garrett Corp
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Filing: 1964-12-23
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Granted: 1966-11-22
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Expires: 1984-12-23
Abstract
No abstract record available.
Inventors
- 👤 Leslie S Wirt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:24
CPC Classifications
F; F01; F01D; F01D25/00; F01D25/30; F05; F05D; F05D2260/00; F05D2260/96; Y; Y02; Y02T; Y02T50/00; Y02T50/60; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/496
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
89 words
IN A SILENCER FOR THE EXHAUST OF A GAS TURBINE, A TUBULAR DUCT WALL IN POSITION FOR EXHAUST GAS FLOW OVER AT LEAST ONE SURFACE, SAID WALL HAVING A MULTIPLICITY OF SLITS EXTENDING THERETHROUGH, SUCH SLITS HAVING A WIDTH NOT EXCEEDING A SMALL FRACTION OF THE THICKNESS OF THE WALL, SAID WALL HAVING A VISCOUS FLOW RESTRICTION THAT IS OF THE SAME ORDER OF MAGNITUDE AS THE SPECIFIC ACOUSTIC IMPEDANCE OF THE GAS, THE THICKNESS OF THE DUCT WALL BEING UNIFORM THROUGHOUT THE LENGTH AND CIRCUMFERENCE OF THE DUCT.
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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) | 1969-11-21 | 1970-05-23 | 1970-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-21 | 1974-05-23 | 1974-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-21 | 1978-05-23 | 1978-11-22 | $7700.00 | Window Closed / Lapsed |