Patent US4759516A successfully refreshed from Google Patents.
US4759516A
Expired / Lapsed
US
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Cascaded turbulence generation inhibitor
Assignee: Enron Corp
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Filing: 1985-09-30
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Granted: 1988-07-26
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Expires: 2005-09-30
Abstract
Abstract A turbulence generation inhibitor comprising a fluid conduit having an interior wall surface with the interior wall surface having a plurality of spaced-apart microscopic grooves formed therein which are parallel to the mean-flow direction. Each of the grooves is defined by oppositely disposed side walls with the side walls of each of the grooves having at least one catenary shaped surface provided thereon.
Inventors
- 👤 Ronald D. Grose
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:57
CPC Classifications
F; F15; F15D; F15D1/00; F15D1/002; F15D1/0025; F15D1/003; F15D1/0035; F15D1/004; B; B64; B64C; B64C21/00; B64C21/10; F15D1/02; F15D1/06; F28; F28F; F28F1/00; F28F1/10; F28F1/40; F28F13/00; F28F13/02; F28F13/18; F28F13/185; B64C2230/00; B64C2230/26; F28F2215/00; F28F2215/10; Y; Y02; Y02T; Y02T50/00; Y02T50/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
65 words
A turbulence generation inhibitor comprising in combination, a fluid conduit having an interior wall surface, said interior wall 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
65 words
A turbulence generation inhibitor comprising in combination, a fluid conduit having an interior wall surface, said interior wall 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
78 words
A turbulence generation inhibitor comprising in combination, a fluid conduit having an interior wall surface, said interior wall 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 catenary shaped surfaces provided thereon.
Claim 4
Dependent Claim
78 words
A turbulence generation inhibitor comprising in combination, a fluid conduit having an interior wall surface, said interior wall 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 catenary shaped surfaces provided thereon.
Claim 5
Dependent Claim
24 words
The turbulence generation inhibitor of claim 1 wherein each of said catenary shaped surfaces having a plurality of smaller catenary shaped surfaces provided thereon.
Claim 6
Dependent Claim
14 words
The turbulence generation inhibitor of claim 1 wherein said catenary shaped surfaces are cascaded.
References Cited (Backward Citations)
US13397A
Cited
US2899150A
Cited
US3273599A
Cited
US1903823A
Cited
US2322632A
Cited
US3525486A
Cited
US3411738A
Cited
US3762468A
Cited
US3776363A
Cited
US4044797A
Cited
US4154296A
Cited
US4248179A
Cited
US4402359A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-26 | 1992-01-25 | 1992-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-26 | 1996-01-25 | 1996-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-26 | 2000-01-25 | 2000-07-26 | $7700.00 | Window Closed / Lapsed |