Patent US3765247A successfully refreshed from Google Patents.
US3765247A
Expired / Lapsed
US
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Air sampling device
Assignee: National Southwire Aluminum Co
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Filing: 1971-10-22
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Granted: 1973-10-16
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Expires: 1991-10-22
Abstract
Abstract This disclosure relates to an air sampling device operated solely by compressed air which is conducted through a venturi tube thereby creating a region of reduced pressure for drawing ambient air into the device where particles or gases carried therein are trapped in a filter type device for analysis. The device includes a manifold having a plurality of fittings each adapted to receive individual sample-collecting chambers whereby several samples may be taken consecutively.
Inventors
- 👤 R Riggs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:07
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/02; G01N1/22; G01N1/26
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
137 words
A portable air sampling device comprising means defining a passage through said device, means adapted to connect said passage to a source of compressed gas, means defining a region of reduced pressure in said passage as compared with the ambient pressure, at least one sample-collecting chamber having pervious sample-collecting means disposed therein, one side of said sample-collecting means communicating with the ambient air and the other side of said sample-collecting means communicating with said region of reduced pressure, manifold means having a plurality of fittings extending therefrom each of which is adapted to receive a sample-collecting chamber, said manifold means disposed in air flow communication between said other side of said sample-collecting means and said region of reduced pressure, and valve means associated with each of said fittings for providing selective utilization of sample-collecting chambers disposed thereon.
Claim 2
Dependent Claim
137 words
A portable air sampling device comprising means defining a passage through said device, means adapted to connect said passage to a source of compressed gas, means defining a region of reduced pressure in said passage as compared with the ambient pressure, at least one sample-collecting chamber having pervious sample-collecting means disposed therein, one side of said sample-collecting means communicating with the ambient air and the other side of said sample-collecting means communicating with said region of reduced pressure, manifold means having a plurality of fittings extending therefrom each of which is adapted to receive a sample-collecting chamber, said manifold means disposed in air flow communication between said other side of said sample-collecting means and said region of reduced pressure, and valve means associated with each of said fittings for providing selective utilization of sample-collecting chambers disposed thereon.
Claim 3
Dependent Claim
30 words
A portable air sampling device as defined in claim 1 wherein said fittings extend outwardly of said device so that said sample-collecting chambers may be readily connected and disconnected therefrom.
Claim 4
Dependent Claim
67 words
A portable air sampling device as defined in claim 1 wherein said means defining a region of reduced pressure is a venturi tube having two ends of a predetermined diameter and a throat portion of a lesser diameter than said ends, and wherein said sample-collecting means communicate with said region of reduced pressure through a pipe which opens into said venturi tube at said throat portion thereof.
Claim 5
Dependent Claim
33 words
An air sampling device as defined in claim 1 wherein said sample-collecting means comprises a membrane filter disposed in said at least one sample-collecting chamber for trapping particles carried in the ambient air.
Claim 6
Dependent Claim
35 words
An air sampling device as defined in claim 1 wherein said sample-collecting means comprises a chemical solution trap disposed in said at least one sample-collecting chamber for trapping gaseous emissions carried in the ambient air.
Claim 7
Dependent Claim
31 words
An air sampling device as defined in claim 1 including a flow meter and valve whereby the rate of flow of ambient air through said device may be measured and controlled.
Claim 8
Dependent Claim
34 words
A portable air sampling device as defined in claim 1 wherein said passage includes an inlet end and an exhaust end, and including sound muffling means disposed at the exhaust end of said passage.
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) | 1976-10-15 | 1977-04-16 | 1977-10-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-15 | 1981-04-16 | 1981-10-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-15 | 1985-04-16 | 1985-10-16 | $7700.00 | Window Closed / Lapsed |