US3901798A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aerosol concentrator and classifier
Assignee: Environmental Research Corp
•
Filing: 1973-11-21
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Granted: 1975-08-26
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Expires: 1993-11-21
Abstract
Abstract An aerosol sampler which concentrates and classifies airborne particles. Particles in the size range of 0.1 - 10 microns are classified according to particle size by means of the particle inertia principle. The unique design reduces particle losses and is characterized by an annular passage in the flow path of the sample.
Inventors
- 👤 Carl M Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:54
CPC Classifications
B; B07; B07B; B07B7/00; B07B7/02
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
149 words
APPARATUS FOR CLASSIFYING AIRBORNE PARTICLES ACCORDING PARTICLE SIZE WHICH COMPRISES: A FIRST PLATE DEFINING A FIRST ORIFICE, A SECOND PLATE SPACED FROM THE FIRST PLATE AND DEFINING A SECOND ORIFICE LARGER THAN AND SUBSTANTIALLY CONCENTRICALLY DISPOSED WITH RESPECT TO THE FIRST ORIFICE, TUBULAR MEANS DEFINING A THIRD ORIFICE DISPOSED SUBSTANTIALLY IN THE PLANE OF THE SECOND ORIFICE, DIRECTED TOWARD, SUBSTANTIALLY THE SIZE OF, AND SUBSTANTIALLY CONCENTRICALLY DISPOSED WITH RESPECT TO THE FIRST ORIFICE, TO THEREBY DEFINE AN ANNULAR PASSAGE BETWEEN THE SECOND ORIFICE AND THE TUBULAR MEANS, MEANS FOR ESTABLISHING COMMUNICATION BETWEEN SAID FIRST ORIFICE, ON THE ONE HAND, AND SAID THIRD ORIFICE AND SAID ANNULAR PASSAGE, ON THE OTHER HAND, AN OUTLET FOR RETURNING AIR PASSAGE THROUGH SAID ANNULAR PASSAGE TO THE ATMOSPHERE, MEANS FOR ESTABLISHING COMUNICATION BETWEN SAID ANNULAR PASSAGE AND SAID OUTLET, AND COLLECTING MEANS COMMUNICATING WITH THE THIRD ORIFICE FOR COLLECTING THE PARTICLES PASSING THERETHROUGH
Claim 2
Dependent Claim
149 words
APPARATUS FOR CLASSIFYING AIRBORNE PARTICLES ACCORDING PARTICLE SIZE WHICH COMPRISES: A FIRST PLATE DEFINING A FIRST ORIFICE, A SECOND PLATE SPACED FROM THE FIRST PLATE AND DEFINING A SECOND ORIFICE LARGER THAN AND SUBSTANTIALLY CONCENTRICALLY DISPOSED WITH RESPECT TO THE FIRST ORIFICE, TUBULAR MEANS DEFINING A THIRD ORIFICE DISPOSED SUBSTANTIALLY IN THE PLANE OF THE SECOND ORIFICE, DIRECTED TOWARD, SUBSTANTIALLY THE SIZE OF, AND SUBSTANTIALLY CONCENTRICALLY DISPOSED WITH RESPECT TO THE FIRST ORIFICE, TO THEREBY DEFINE AN ANNULAR PASSAGE BETWEEN THE SECOND ORIFICE AND THE TUBULAR MEANS, MEANS FOR ESTABLISHING COMMUNICATION BETWEEN SAID FIRST ORIFICE, ON THE ONE HAND, AND SAID THIRD ORIFICE AND SAID ANNULAR PASSAGE, ON THE OTHER HAND, AN OUTLET FOR RETURNING AIR PASSAGE THROUGH SAID ANNULAR PASSAGE TO THE ATMOSPHERE, MEANS FOR ESTABLISHING COMUNICATION BETWEN SAID ANNULAR PASSAGE AND SAID OUTLET, AND COLLECTING MEANS COMMUNICATING WITH THE THIRD ORIFICE FOR COLLECTING THE PARTICLES PASSING THERETHROUGH
Claim 3
Dependent Claim
27 words
The apparatus of claim 1 and means for providing a pressure gradient decreasing in pressure from the first orifice to the annular passage and the third orifice.
Claim 4
Dependent Claim
12 words
The apparatus of claim 1 wherein the first orifice is substantially circular.
Claim 5
Dependent Claim
27 words
The apparatus of claim 3 wherein the spacing between the first plate and the second plate of 0.3 - 3 times the diameter of the first orifice.
Claim 6
Dependent Claim
29 words
The apparatus of claim 4 wherein the distance between the annular passage and the third orifice is equal to or less than one-half the diameter of the first orifice.
Claim 7
Dependent Claim
23 words
The apparatus of claim 5 wherein the area of the annular passage is 0.6 - 1 times the area of the first orifice.
Claim 8
Dependent Claim
24 words
The apparatus of claim 6 wherein the thickness of the first plate is less than or equal to the diameter of the first orifice.
Claim 9
Dependent Claim
182 words
The apparatus of claim 1 and secondary stage classifying means comprising: a secondary first plate defining a secondary first orifice disposed in the path of the particles after passage through the third orifice and prior to entrance into the collecting means; means for establishing communication between said third orifice and said secondary first orifice; a secondary second plate spaced from the secondary first plate and defining a secondary second orifice larger than and substantially concentrically disposed with respect to the secondary first orifice; and secondary tubular means defining a secondary third orifice communicating with the collecting means and disposed substantially in the plane of the secondary second orifice, directed toward, substantially the size of, and substantially concentrically disposed with respect to the secondary first orifice to thereby define a secondary annular passage between the secondary second orifice and the secondary tubular means; means for establishing communication between said secondary first orifice, on the one hand, and said secondary third orifice and said secondary annular passage, on the other hand; and means for establishing communication between said secondary annular passage and said outlet.
Claim 10
Dependent Claim
52 words
The apparatus of claim 8 and means for providing a pressure gradient decreasing in pressure from the first orifice to the annular passage and the third orifice, from the third orifice to the secondary first orifice, and from the secondary first orifice to the secondary annular passage and the secondary third orifice.
Claim 11
Dependent Claim
13 words
The apparatus of claim 9 wherein the secondary first orifice is substantially circular.
Claim 12
Dependent Claim
30 words
The apparatus of claim 10 wherein the spacing between the secondary first plate and the secondary second plate is 0.3 - 3 times the diameter of the secondary first orifice.
Claim 13
Dependent Claim
31 words
The apparatus of claim 11 wherein the distance between the secondary annular passage and the secondary third orifice is equal to or less than one-half the diameter of the first orifice.
Claim 14
Dependent Claim
24 words
The apparatus of claim 12 wherein the area of the annular passage is 0.6 - 1 times the area of the secondary first orifice.
Claim 15
Dependent Claim
26 words
The apparatus of claim 13 wherein the thickness of the secondary first plate is less than or equal to the diameter of the secondary first orifice.
References Cited (Backward Citations)
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US3288285A
Cited
US3725271A
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US3731464A
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US3780502A
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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) | 1978-08-25 | 1979-02-24 | 1979-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-08-25 | 1983-02-24 | 1983-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-08-25 | 1987-02-24 | 1987-08-26 | $7700.00 | Window Closed / Lapsed |