US4695228A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Turbo-machine blade
Assignee: Kraftwerk Union AG
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Filing: 1981-07-27
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Granted: 1987-09-22
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Expires: 2001-07-27
Abstract
Abstract Turbo-machine blade with a profile contour having a convex leading edge region, a convex suction side region, a convex trailing edge region and a concavely curved pressure side region, including profile segments being blended into each other forming the profile contour and following each other in a continuous curve, the profile segments including: (a) a first ellipse segment and a second ellipse segment adjacent to the first ellipse segment in the leading edge region, (b) a first circle segment adjacent to the second ellipse segment and a second order parabola segment adjacent to the first circle segment in the suction side region, (c) a second circle segment adjacent to the parabola segment in the trailing edge region, and (d) a third circle segment adjacent to the second circle segment and the first ellipse segment in the pressure side region.
Inventors
- 👤 Bebe-Titu Purcaru
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:58
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/14; F01D5/141; F05; F05D; F05D2240/00; F05D2240/20; F05D2240/30; F05D2240/301; F05D2250/00; F05D2250/10; F05D2250/14; F05D2250/16; Y; Y10; Y10S; Y10S416/00; Y10S416/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
139 words
Turbo-machine blade with a profile contour having a convex leading edge region, a convex suction side region, a convex trailing edge region and a concavely curved pressure side region, comprising profile segments being blended into each other forming the profile contour and following each other in a continuous curve, said profile segments including: (a) a first ellipse segment and a second ellipse segment adjacent to said first ellipse segment in the leading edge region, (b) a first circle segment adjacent to said second ellipse segment and a second order parabola segment adjacent to said first circle segment in the suction side region, (c) a second circle segment adjacent to said parabola segment in the trailing edge region, and (d) a third circle segment adjacent to said second circle segment and said first ellipse segment in the pressure side region.
Claim 2
Dependent Claim
139 words
Turbo-machine blade with a profile contour having a convex leading edge region, a convex suction side region, a convex trailing edge region and a concavely curved pressure side region, comprising profile segments being blended into each other forming the profile contour and following each other in a continuous curve, said profile segments including: (a) a first ellipse segment and a second ellipse segment adjacent to said first ellipse segment in the leading edge region, (b) a first circle segment adjacent to said second ellipse segment and a second order parabola segment adjacent to said first circle segment in the suction side region, (c) a second circle segment adjacent to said parabola segment in the trailing edge region, and (d) a third circle segment adjacent to said second circle segment and said first ellipse segment in the pressure side region.
Claim 3
Dependent Claim
49 words
Turbo-machine blade according to claim 1, wherein said first ellipse segment and said second ellipse segment are formed of ellipses having a common greater half axis and a common vertex point lying on said greater half axis, said ellipses being blended into each other at said common vertex point.
Claim 4
Dependent Claim
19 words
Turbo-machine blade according to claim 2, wherein said first and second ellipses have smaller half axes of equal length.
Claim 5
Dependent Claim
24 words
Turbo-machine blade according to claim 3, wherein said larger and smaller half axes of said first and second ellipses all are of equal length.
Claim 6
Dependent Claim
30 words
Turbo-machine blade acoording to claim 1, wherein said second order parabola segment has a vertex point and said first circle segment in said vertex point continues in said parabola segment.
Claim 7
Dependent Claim
32 words
Turbo-machine blade according to claim 1, including a blade base and a blade point, the profile contour being formed of second order curves having parameters varying between said base and said point.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-09-21 | 1991-03-23 | 1991-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-09-21 | 1995-03-23 | 1995-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-09-21 | 1999-03-23 | 1999-09-22 | $7700.00 | Window Closed / Lapsed |