US3606572A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Airfoil with porous leading edge
Assignee: Motors Liquidation Co
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Filing: 1969-08-25
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Granted: 1971-09-20
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Expires: 1989-08-25
Abstract
Abstract A HOLLOW AIRFOIL FOR USE AS A TURBINE VANE OR BLADE IS MADE UP OF A NUMBER OF SHEET METAL LAYERS BONDED TOGETHER AND FOLDED AT THE LEADING EDGE. HOLES FOR TRANSPIRATION COOLING OF THE BLADE ARE FORMED IN THE LEADING EDGE, THE HOLES IN THE SUCCESSIVE LAYERS BEING DISPOSED IN SPANWISE ROWS WITH THE HOLES IN EACH LAYER PARTIALLY OVERLAPPING THE HOLES IN THE CORRESPONDING ROW IN ADJACENT LAYERS. THESE HOLES IMPROVE THE FOLDING PROPERTIES OF THE LEADING EDGE. SOME OF THEM ARE CONNECTED TO CONDUCT AIR TO THE FORWARD PORTION OF THE POROUS SIDE WALLS OF THE AIRFOIL.
Inventors
- 👤 Ronald P Schwedland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:04
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/18; F01D5/182; F01D5/184; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49336; Y10T29/49339; Y10T29/49341
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-09-19 | 1975-03-21 | 1975-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-19 | 1979-03-21 | 1979-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-19 | 1983-03-21 | 1983-09-20 | $7700.00 | Window Closed / Lapsed |