US4919303A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for feeding particulate material
Assignee: Rio Tinto Alcan International Ltd
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Filing: 1988-09-07
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Granted: 1990-04-24
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Expires: 2008-09-07
Abstract
Abstract Method of feeding particulate material by the use of apparatus comprising a passage having an upstream section 10 provided with baffles 18, 20, leading to a chicane 14, 16 and then to a downstream section 12. A gas pipe 22 feeds low-pressure gas to a slot 26 through which a flow of gas can be started or stopped, so as to start or stop the passage of the material through the chicane.
Inventors
- 👤 Ghislain Boudreault
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 09:16
CPC Classifications
B; B65; B65G; B65G53/00; B65G53/04; B65G53/16; B65G53/18; B65G53/22; B01; B01J; B01J8/00; B01J8/0015; B01J8/003; C; C25; C25C; C25C3/00; C25C3/06; C25C3/14
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
197 words
A method of feeding particulate material by the use of apparatus comprising a passage having a floor, an upstream section for receiving the material and conveying it in a downward direction, and a downstream section for delivering the material, the two sections being connected by a chicane consisting of a horizontal or upwardly inclined section of the passage of sufficient length to cause the particulate material to come to rest therein in the absence of a flow of gas there-through, a baffle system in the upstream section comprising at least two baffles mounted on opposite sides of the upstream section of the passage to cause the particulate material to follow a tortuous path round them to control the rate of flow of the material to the chicane, a pipe leading to a slot within the passage, the slot extending horizontally adjacent the floor of the passage and facing downstream near the upstream end of the chicane, which method comprises passing through the slot air compressed at a pressure below one meter of water gauge and starting and stopping the passage of air at predetermined intervals so as to start and stop the flow of the particulate material.
Claim 2
Independent Claim
197 words
A method of feeding particulate material by the use of apparatus comprising a passage having a floor, an upstream section for receiving the material and conveying it in a downward direction, and a downstream section for delivering the material, the two sections being connected by a chicane consisting of a horizontal or upwardly inclined section of the passage of sufficient length to cause the particulate material to come to rest therein in the absence of a flow of gas there-through, a baffle system in the upstream section comprising at least two baffles mounted on opposite sides of the upstream section of the passage to cause the particulate material to follow a tortuous path round them to control the rate of flow of the material to the chicane, a pipe leading to a slot within the passage, the slot extending horizontally adjacent the floor of the passage and facing downstream near the upstream end of the chicane, which method comprises passing through the slot air compressed at a pressure below one meter of water gauge and starting and stopping the passage of air at predetermined intervals so as to start and stop the flow of the particulate material.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein the pressure of the compressed air is between 50 and 200 mm of water gauge.
Claim 4
Dependent Claim
26 words
The method of claim 1 wherein a preheating chamber for the particulate material is provided between the upstream section, below the baffler system, and the chicane.
Claim 5
Dependent Claim
88 words
A method according to claim 1 wherein the air is introduced into the pipe which connects with a distribution chamber so as to ensure constant air pressure across the slot, the slot being positioned so as to be immersed at all times in the particulate material and such that the air from the slot is caused to flow across the floor of the chicane such that the base of the pile of particulate material is disturbed sufficiently to cause particulate material to flow under gravity round the chicane.
References Cited (Backward Citations)
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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) | 1993-04-23 | 1993-10-23 | 1994-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-04-23 | 1997-10-23 | 1998-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-04-23 | 2001-10-23 | 2002-04-24 | $7700.00 | Window Closed / Lapsed |