Patent US4506541A successfully refreshed from Google Patents.
US4506541A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Measurement of bulk density of particulate materials
Assignee: Mount Isa Mines Ltd
•
Filing: 1982-03-16
•
Granted: 1985-03-26
•
Expires: 2002-03-16
Abstract
Abstract Apparatus for measuring the bulk density and mass flow rate of pulverized coal entrained in air along a duct 6 comprises beta radiation source means 7, radiation detection means 8 and a shield 9 to intercept direct radiation falling on the detector means which thereby measures the diffuse radiation scattered by the coal particles. That measurement plus a signal indicating linear coal particle speed is fed to a data processor which calculates the bulk density and mass flow rate.
Inventors
- 👤 Jock B. Cunningham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:38
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/76; G01F1/86; G01F1/74; G01N; G01N23/00; G01N23/02; G01N23/06; G01N23/12; G01N9/00; G01N9/24
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
153 words
A bulk density measuring apparatus comprising: uncollimated radiation source means; uncollimated radiation detector means spaced from said source means to measure radiation received therefrom; containment means for the material of which the density is to be determined such that a charge of the material within said containment means occupies the space between the source means and detector means, said containment means comprising a duct along which said material is caused to flow, said radiation means and said radiation source means being mounted externally of said containment means; a radiation opaque shield positioned to prevent direct radiation from the source means reaching the detector means; and radiation transparent windowpanes respectively associated with the detector means and source means, the radiation entering and leaving the containment means through said windowpanes, each said windowpane being inclined relative to the direction of flow with its downstream edge more outboard of the duct wall than its upstream edge.
Claim 2
Dependent Claim
153 words
A bulk density measuring apparatus comprising: uncollimated radiation source means; uncollimated radiation detector means spaced from said source means to measure radiation received therefrom; containment means for the material of which the density is to be determined such that a charge of the material within said containment means occupies the space between the source means and detector means, said containment means comprising a duct along which said material is caused to flow, said radiation means and said radiation source means being mounted externally of said containment means; a radiation opaque shield positioned to prevent direct radiation from the source means reaching the detector means; and radiation transparent windowpanes respectively associated with the detector means and source means, the radiation entering and leaving the containment means through said windowpanes, each said windowpane being inclined relative to the direction of flow with its downstream edge more outboard of the duct wall than its upstream edge.
Claim 3
Dependent Claim
26 words
Apparatus according to claim 1 in association with a data processor connected to receive data from said detector means and able to compute the bulk density.
Claim 4
Dependent Claim
15 words
Apparatus according to claim 1 including means to measure the flow speed of the material.
Claim 5
Dependent Claim
42 words
Apparatus according to claim 3 in association with a data processor connected to receive data from said detector means and said means to measure the flow speed and able to calculate the mass flow rate of the material in a predetermined time.
Claim 6
Dependent Claim
20 words
Apparatus according to claim 3 including means to measure the pressure and temperature of a gaseous component of said material.
Claim 7
Dependent Claim
49 words
Apparatus according to claim 5 in association with a data processor connected to receive data from said detector means, said means to measure the flow speed and said means to measure pressure and temperature and able to calculate the mass flow rate of any non-gaseous components of the material.
References Cited (Backward Citations)
US2925007A
Cited
US3300640A
Cited
US3654109A
Cited
US4053229A
Cited
US4072421A
Cited
US4178103A
Cited
US4282433A
Cited
US4210809A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-03-25 | 1988-09-24 | 1989-03-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-03-25 | 1992-09-24 | 1993-03-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-03-25 | 1996-09-24 | 1997-03-26 | $7700.00 | Window Closed / Lapsed |