US4650138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cascaded micro-groove aerodynamic drag reducer
Assignee: Enron Corp
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Filing: 1985-09-30
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Granted: 1987-03-17
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Expires: 2005-09-30
Abstract
Abstract A cascaded micro-groove aerodynamic drag reducer is provided by creating a plurality of spaced-apart, microscopic grooves in the aerodynamic surface. Each of the grooves is defined by oppositely disposed side walls with each of the side walls of each groove having at least one catenary shaped surface provided thereon. In the preferred embodiment, each of the side walls is provided with a plurality of catenary shaped surfaces with each of the catenary shaped surfaces having a plurality of smaller catenary surfaces provided thereon.
Inventors
- 👤 Ronald D. Grose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:00
CPC Classifications
B; B64; B64C; B64C21/00; B64C21/10; B64C2230/00; B64C2230/26; F; F05; F05D; F05D2250/00; F05D2250/10; F05D2250/18; F05D2250/183; F05D2250/20; F05D2250/29; F05D2250/294; Y; Y02; Y02T; Y02T50/00; Y02T50/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
53 words
In an aerodynamic surface, said surface having a plurality of spaced-apart microscopic grooves formed therein which are parallel to the mean flow direction, each of said grooves being defined by oppositely disposed side walls, each of said side walls of each of said grooves having a plurality of catenary shaped surfaces provided thereon.
Claim 2
Dependent Claim
53 words
In an aerodynamic surface, said surface having a plurality of spaced-apart microscopic grooves formed therein which are parallel to the mean flow direction, each of said grooves being defined by oppositely disposed side walls, each of said side walls of each of said grooves having a plurality of catenary shaped surfaces provided thereon.
Claim 3
Dependent Claim
67 words
In an aerodynamic surface, said surface having a plurality of spaced-apart microscopic grooves formed therein which are parallel to the mean flow direction, each of said grooves being defined by oppositely disposed side walls, each of said side walls of each of said grooves having at least one catenary shaped surface provided thereon, said catenary shaped surface having a plurality of smaller catenary shaped surfaces provided thereon.
Claim 4
Dependent Claim
67 words
In an aerodynamic surface, said surface having a plurality of spaced-apart microscopic grooves formed therein which are parallel to the mean flow direction, each of said grooves being defined by oppositely disposed side walls, each of said side walls of each of said grooves having at least one catenary shaped surface provided thereon, said catenary shaped surface having a plurality of smaller catenary shaped surfaces provided thereon.
Claim 5
Dependent Claim
23 words
The aerodynamic surface of claim 2 wherein each of said catenary shaped surfaces have a plurality of smaller catenary shaped surfaces provided thereon.
Claim 6
Dependent Claim
13 words
The aerodynamic surface of claim 2 wherein said catenary shaped surfaces are cascaded.
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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) | 1990-03-16 | 1990-09-15 | 1991-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-16 | 1994-09-15 | 1995-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-16 | 1998-09-15 | 1999-03-17 | $7700.00 | Window Closed / Lapsed |