US3867640A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dust sampling system
Assignee: Edward C Levy Co
•
Filing: 1972-03-09
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Granted: 1975-02-18
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Expires: 1992-03-09
Abstract
Abstract A monitoring system for dusty, moist gases such as the ambient air near material handling equipment, exhaust fumes from cement or lime kilns, and the like. An infrared heater is used to vaporize moisture particles in the gases and thereby render such moisture invisible. The ability of light to penetrate the gas is then measured to determine the dust density thereof. The density measurement may be used for various purposes such as actuating an alarm or dust suppression apparatus.
Inventors
- 👤 Lewis A Paulsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:00
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0011
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
105 words
A dust sampling system for monitoring the dust content of moist gases including an open conduit having a gas inlet and outlet, a radiant heat source associated with said inlet and operable to vaporize moisture particles suspended in moving gases entering said inlet, a constant intensity light source directing a beam of light across said conduit downstream from said heat source, a light sensor arranged to receive light from said source and means controlled by said sensor responsive to a reduction in the amount of light received by said detector from said source resulting from an increase in the dust particles suspended in said gases.
Claim 2
Dependent Claim
105 words
A dust sampling system for monitoring the dust content of moist gases including an open conduit having a gas inlet and outlet, a radiant heat source associated with said inlet and operable to vaporize moisture particles suspended in moving gases entering said inlet, a constant intensity light source directing a beam of light across said conduit downstream from said heat source, a light sensor arranged to receive light from said source and means controlled by said sensor responsive to a reduction in the amount of light received by said detector from said source resulting from an increase in the dust particles suspended in said gases.
Claim 3
Dependent Claim
14 words
The structure set forth in claim 1 in which said means comprises a recorder.
Claim 4
Dependent Claim
14 words
The structure set forth in claim 1 in which said means comprises an alarm.
Claim 5
Dependent Claim
17 words
The structure set forth in claim 1 in which said radiant heat source comprises an infrared lamp.
Claim 6
Dependent Claim
14 words
The structure set forth in claim 1 in which said sensor comprises a bolometer.
Claim 7
Dependent Claim
19 words
The structure set forth in claim 1 including a fan for inducing the flow of gases through said conduit.
Claim 8
Dependent Claim
18 words
The structure set forth in claim 1 including a hood mounted at the inlet end of said conduit.
Claim 9
Dependent Claim
23 words
The structure set forth in claim 1 including an air collecting hood at said inlet arranged adjacent a conveyor for dusty particulate materials.
References Cited (Backward Citations)
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Cited
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US3643624A
Cited
US3600590A
Cited
US3640624A
Cited
US3731743A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |