Patent USH324H successfully refreshed from Google Patents.
USH324H
Expired / Lapsed
US
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Fence for reducing turbulence
Assignee: United States Department of the Army
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Filing: 1987-02-27
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Granted: 1987-09-01
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Expires: 2007-02-27
Abstract
Abstract A system for lowering the level of turbulence in an opening over which a eam of air is flowing at a subsonic velocity wherein a fence positioned adjacent to the opening at an upstream location is provided with a plurality of apertures in the distal portion thereof. The apertures in the distal portion of the fence spread the shear layer of air flowing over the top edge of the fence and substantially reduce turbulence within the opening.
Inventors
- 👤 Donald V. Rubin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-10 00:45
CPC Classifications
B; B64; B64C; B64C23/00; B64C23/005; B64C2230/00; B64C2230/08; B64C2230/24; Y; Y02; Y02T; Y02T50/00; Y02T50/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
74 words
A system for lowering the level of turbulance in an opening through a wall over which air is flowing at a subsonic velocity; said opening having a predetermined length, L; comprising a fence secured to the aircraft wall at a location adjacent and parallel to a leading edge of said opening; said fence having only distal portion thereof a plurality, said apertures making up to 50 percent of the area of said distal portion
Claim 2
Independent Claim
74 words
A system for lowering the level of turbulance in an opening through a wall over which air is flowing at a subsonic velocity; said opening having a predetermined length, L; comprising a fence secured to the aircraft wall at a location adjacent and parallel to a leading edge of said opening; said fence having only distal portion thereof a plurality, said apertures making up to 50 percent of the area of said distal portion
Claim 3
Dependent Claim
26 words
The system of claim 1 wherein the apertured distal portion of the fence makes up 35 to 65 percent of the total area of the fence.
Claim 4
Dependent Claim
17 words
The system of claim 2 wherein the apertures make up about 40 percent of said distal portion.
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) | 1990-08-31 | 1991-03-02 | 1991-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-31 | 1995-03-02 | 1995-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-31 | 1999-03-02 | 1999-09-01 | $7700.00 | Window Closed / Lapsed |