Patent US3554663A successfully refreshed from Google Patents.
US3554663A
Expired / Lapsed
US
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Cooled blade
Assignee: Motors Liquidation Co
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Filing: 1968-09-25
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Granted: 1971-01-12
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Expires: 1988-09-25
Abstract
Abstract A TRANSPIRATION COOLED BLADE FOR A HIGH TEMPERATURE TURBINE HAS A WALL OF LAMINATED STRUCTURE OF CONTROLLED POROSITY MADE UP OF SEVERAL LAYERS OF THIN SHEET METAL. INNER STRENGHTENING LAYERS HAVE GROOVES OR CHANNELS FOR CONDUCTION OF COOLING AIR INTO THE WALL WHICH EXTEND SPANWISE OF THE BLADE AND ARE TAPERED TOWARD THE BASE OF THE BLADE TO PROVIDE AN INCREASE IN CROSS-SECTION AND STRENGTH OF THE BLADE TOWARD THE BASE.
Inventors
- 👤 Harold E Helms
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:18
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/18; F01D5/182; F01D5/184
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |