US3710557A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air sampling device
Assignee: United States Atomic Energy Commission
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Filing: 1972-03-17
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Granted: 1973-01-16
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Expires: 1992-03-17
Abstract
Abstract An air sampling device including a sampling duct containing a particulate filter and a venturi shroud surrounding the duct. Flow tubes are provided for delivering high velocity air from the venturi into the region behind the filter. Control jets in the region of the venturi constriction enable the effect of the venturi to be varied by the injection of pressurized air from an auxiliary source such as an aircraft cabin or the utilization of the siphon pumping action of the venturi.
Inventors
- 👤 J Couchman
- 👤 G Applebay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 00:50
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/02; G01N1/22; G01N1/2247; G01N1/2202; G01N2001/222; G01N2001/2223; G01N2001/225
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
119 words
An air sampling device comprising: a. a sampling duct having an air inlet portion and an air outlet portion, b. a filter positioned across said duct between said inlet and said outlet portions, c. venturi shroud surrounding said duct and coaxial therewith and spaced from said duct so that the venturi action of said shroud exhausts air from said outlet portion when air flows through said shroud and said duct, and d. conduit means connecting said outlet portion to a source of high velocity air for delivering into said outlet portion a flow of high velocity air from said source which is in addition to the flow of air through said filter but in the same general direction therewith.
Claim 2
Dependent Claim
119 words
An air sampling device comprising: a. a sampling duct having an air inlet portion and an air outlet portion, b. a filter positioned across said duct between said inlet and said outlet portions, c. venturi shroud surrounding said duct and coaxial therewith and spaced from said duct so that the venturi action of said shroud exhausts air from said outlet portion when air flows through said shroud and said duct, and d. conduit means connecting said outlet portion to a source of high velocity air for delivering into said outlet portion a flow of high velocity air from said source which is in addition to the flow of air through said filter but in the same general direction therewith.
Claim 3
Dependent Claim
53 words
The air sampling device of claim 1 including jets in said venturi shroud in the region of the venturi constriction and fluid flow communicating means in connection with said jets whereby said jets may be connected to a source of pressurized air or to vacuum operated equipment external to said air sampling device.
Claim 4
Dependent Claim
68 words
The air sampling device of claim 2 wherein said means for delivering said additional flow of air include a plurality of tubes mounted in intersecting relationship with said outlet portion so as to bring air from said venturi to the region behind said filter with the area defined within the array of said tubes at their discharge ends approximating the area of the opening of said inlet nozzle.
Claim 5
Dependent Claim
45 words
The air sampling device of claim 1 wherein said means for delivering said additional flow of air include at least one tube mounted in intersecting relationship with said outLet portion so as to bring air from said venturi shroud to the region behind said filter.
Claim 6
Dependent Claim
26 words
The air sampling device of claim 1 wherein said inlet portion has an inlet nozzle which extends forwardly of the forward edge of said venturi shroud.
Claim 7
Dependent Claim
44 words
The air sampling device of claim 5 wherein said filter is larger than the area of the opening of said nozzle and the cross-sectional area of said inlet portion increases with distance from said inlet nozzle along at least a portion of its length.
Claim 8
Dependent Claim
22 words
The air sampling device of claim 6 wherein said outlet portion terminates in the region of the constriction of said venturi shroud.
Claim 9
Dependent Claim
45 words
The air sampling device of claim 6 wherein said means for delivering said additional flow of air include at least one tube mounted in intersecting relationship with said outlet portion so as to bring air from said venturi shroud to the region behind said filter.
Claim 10
Dependent Claim
68 words
The air sampling device of claim 7 wherein said means for delivering said additional flow of air include a plurality of tubes mounted in intersecting relationship with said outlet portion so as to bring air from said venturi to the region behind said filter with the area defined within the array of said tubes at their discharge ends approximating the area of the opening of said inlet nozzle.
Claim 11
Dependent Claim
70 words
The air sampling device of claim 9 wherein the cross-sectional area of said inlet portion expands at a total angle not exceeding about 14* and including jets in said venturi shroud in the region of the venturi constriction and fluid flow communicating means in connection with said jets whereby said jets may be connected to a source of pressurized air or to vacuum operated equipment external to said sampling device.
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) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |