Patent US3034692A successfully refreshed from Google Patents.
Patent US3590629A successfully refreshed from Google Patents.
US3590629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for the continuous detection of dust in the atmosphere
Assignee: Charbonnages de France CDF
•
Filing: 1970-04-06
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Granted: 1971-07-06
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Expires: 1990-04-06
Abstract
Abstract A thin filter element is mounted integrally with a centrifugal fanlike rotor so that when the rotor is rotated air will be drawn through the filter. This assembly is mounted within a fairly spaceous enclosure with limited ingress and egress orifices so that air will tend to be recirculated within the enclosure. Solid particles in the air entering the enclosure will tend to be collected in a spot at the center of the filter element, the size of the spot being a measure of the amount of dust in the air.
Inventors
- 👤 Paul Courbon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 01:10
CPC Classifications
G; G01; G01N; G01N1/00; G01N1/02; G01N1/22; G01N1/2202; G01N1/2211; G01N1/2205; G01N1/24; G01N2001/222; G01N2001/2223
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
19 words
A device as claimed in claim 1, in which said radial fan is a vane fan with radial delivery.
Claim 2
Dependent Claim
34 words
A device as claimed in claim 2, in which a thick disc made of permeable material and contained in an impermeable cylindrical ring is Disposed between said thin filtering element and said vane fan.
Claim 3
Dependent Claim
34 words
A device as claimed in claim 1, in which said radial fan is constituted by a thick disc made of permeable material and disposed between said thin filtering element and an impermeable supporting plate.
Claim 4
Dependent Claim
22 words
A device as claimed in claim 4, in which a cylindrical recess is hollowed out in the central zone of said disc.
Claim 5
Dependent Claim
16 words
A device in accordance with claim 3, in which said permeable material is a plastic foam.
Claim 6
Dependent Claim
15 words
A device as claimed in claim 6, in which said permeable material is polyurethane foam.
Claim 7
Dependent Claim
20 words
A device as claimed in claim 1, in which said thin filtering element has the shape of a flat disc.
Claim 8
Dependent Claim
26 words
A device as claimed in claim 1, in which the central zone of said thin filtering element is in slight depression with respect to its periphery.
Claim 9
Dependent Claim
17 words
A device as claimed in claim 1, in which said thin filtering element is a filtering diaphragm.
Claim 10
Dependent Claim
26 words
A device as claimed in claim 1, in which a cover provided with peripheral suction orifices is fixed on the upper wall of said sampling chamber.
Claim 11
Dependent Claim
37 words
A device as claimed in claim 11, in which the axes of said peripheral suction orifices and the axes of said peripheral evacuation orifices are at right angles to the axis of rotation of the rotating system.
Claim 12
Dependent Claim
23 words
A device as claimed in claim 1, in which at least the upper wall of said sampling chamber is made of transparent material.
Claim 13
Dependent Claim
25 words
A device as claimed in claim 13, in which concentric circles of increasing diameters are drawn on the free face of aid thin filtering element.
Claim 14
Dependent Claim
31 words
A device is claimed in claim 1, in which said axial suction orifice is provided with a conduit delivering in the vicinity of the free face of said thin filtering element.
Claim 15
Dependent Claim
25 words
A device as claimed in claim 1, in which an element impregnated with colored reagents is fixed under the upper wall of said sampling chamber.
References Cited (Backward Citations)
US3092583A
Cited
US3458974A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-05 | 1975-01-04 | 1975-07-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-05 | 1979-01-04 | 1979-07-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-05 | 1983-01-04 | 1983-07-06 | $7700.00 | Window Closed / Lapsed |