Patent US3177972A successfully refreshed from Google Patents.
US3177972A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sound absorbing gas turbine exhaust duct
Assignee: Garrett Corp
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Filing: 1960-12-14
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Granted: 1965-04-13
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Expires: 1980-12-14
Abstract
No abstract record available.
Inventors
- 👤 Leslie S Wirt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:44
CPC Classifications
F; F01; F01D; F01D25/00; F01D25/30; F05; F05D; F05D2260/00; F05D2260/96
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
60 words
AN EXHAUST DUCT FOR ATTENUATING THE SOUND OF A GAS TURBINE COMPRISING: A CONDUIT HAVING A CURVE THEREIN; AND A CURVED VANE IN THE CURVED PORTION OF SAID CONDUIT DIVIDING SAID CONDUIT INTO A PLURALITY OF SUBSTANTIALLY PARALLEL PASSAGES, SAID VANE BEING CONSTRUCTED OF A THIN SHEET OF SLIGHTLY POROUS METAL HAVING A VISCOUS FLOW RESISTANCE GREATER THAN 15 RAYLS.
Claim 2
Dependent Claim
60 words
AN EXHAUST DUCT FOR ATTENUATING THE SOUND OF A GAS TURBINE COMPRISING: A CONDUIT HAVING A CURVE THEREIN; AND A CURVED VANE IN THE CURVED PORTION OF SAID CONDUIT DIVIDING SAID CONDUIT INTO A PLURALITY OF SUBSTANTIALLY PARALLEL PASSAGES, SAID VANE BEING CONSTRUCTED OF A THIN SHEET OF SLIGHTLY POROUS METAL HAVING A VISCOUS FLOW RESISTANCE GREATER THAN 15 RAYLS.
References Cited (Backward Citations)
US1844104A
Cited
GB416278A
Cited
US2112608A
Cited
FR54338E
Cited
US2543461A
Cited
GB829012A
Cited
US2826261A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-12 | 1968-10-12 | 1969-04-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-12 | 1972-10-12 | 1973-04-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-12 | 1976-10-12 | 1977-04-13 | $7700.00 | Window Closed / Lapsed |