US4631482A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dust flow inducing monitor
Assignee: Oxford Instruments America Inc
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Filing: 1984-10-09
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Granted: 1986-12-23
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Expires: 2004-10-09
Abstract
Abstract Airborne dust concentration in a silo or the like is measured by inducing flow in one or more Venturi nozzles (10) located in the area of airborne dust. A triboelectric sensor probe electrode (20) is located at the nozzle inlet section (12) and flow is induced by a feed of inductive air through an annular channel located in the wall of the nozzle downstream of the electrode.
Inventors
- 👤 Robert E. Newton
- 👤 Russell S. Girgenti
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 12:52
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/60; G01N15/00; G01N15/06; G01N15/0656
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
157 words
Apparatus for dust concentration detection in a gas volume comprising suspended dust particles comprising: (a) at least one means for converting a selected portion of the gas volume into a small cross-section i.e., less than one squ. in., fast gas stream of velocity of at least 1,000 feet per minute, said means comprising a gas flow inductor as a source of negative pressure, (b) means for creating a charge transfer and resultant electrical signal varying in relation to dust concentration in the gas stream, (c) the apparatus being constructed and arranged to provide a velocity-charge transfer match that produces a sensitive reading and avoids dust particle collection within the means for creating, and (d) apparatus wherein the means for converting comprises a gas flow inductor as a source of negative pressure, wherein the inductor comprises a Venturi with a throat and with annular inductor gas flow through a portion thereof downstream of the throat of said Venturi.
Claim 2
Dependent Claim
157 words
Apparatus for dust concentration detection in a gas volume comprising suspended dust particles comprising: (a) at least one means for converting a selected portion of the gas volume into a small cross-section i.e., less than one squ. in., fast gas stream of velocity of at least 1,000 feet per minute, said means comprising a gas flow inductor as a source of negative pressure, (b) means for creating a charge transfer and resultant electrical signal varying in relation to dust concentration in the gas stream, (c) the apparatus being constructed and arranged to provide a velocity-charge transfer match that produces a sensitive reading and avoids dust particle collection within the means for creating, and (d) apparatus wherein the means for converting comprises a gas flow inductor as a source of negative pressure, wherein the inductor comprises a Venturi with a throat and with annular inductor gas flow through a portion thereof downstream of the throat of said Venturi.
Claim 3
Dependent Claim
26 words
Apparatus in accordance with claim 1 wherein the means (b) for creating comprises an electrode probe in the inlet cross-section of the throat of said Venturi.
Claim 4
Dependent Claim
16 words
Apparatus in accordance with claim 1 wherein multiple units for creating are provided at distributed locations.
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) | 1989-12-22 | 1990-06-23 | 1990-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-12-22 | 1994-06-23 | 1994-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-12-22 | 1998-06-23 | 1998-12-23 | $7700.00 | Window Closed / Lapsed |