US3584841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slurry circulation apparatus and method
Assignee: Abrasive Developments Ltd
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Filing: 1968-10-21
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Granted: 1971-06-15
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Expires: 1988-10-21
Abstract
Abstract The disclosure describes apparatus for circulating slurry from a tank in which the solid particles of the slurry settle, the apparatus comprising a passage which opens at one end into the tank above the level of the particles so that liquid can enter the passage, the other end of the passage being connected to a pump and an outlet aperture being provided in the tank to lead particles into the passage intermediate the ends thereof. There is also described a method of slurry circulation as above.
Inventors
- 👤 Anthony Gerard Field
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:24
CPC Classifications
B; B24; B24C; B24C7/00; B24C7/0007; B24C9/00; B24C9/003
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
113 words
Apparatus for circulating a slurry which consists of a mixture of liquid and solid particles, the apparatus comprising a tank to receive the slurry and having a lower part shaped to lead the particles settling therein to an outlet aperture adjacent the bottom of the tank, a passage into which the outlet aperture opens intermediate the ends of the passage, one end of the passage communicating with the tank at a level above that normally occupied by the settled particles but below the surface of the supernatant liquid on the settled particles, and a pump arranged to withdraw the slurry from the tank, the other end of the passage communicating with the pump.
Claim 2
Dependent Claim
113 words
Apparatus for circulating a slurry which consists of a mixture of liquid and solid particles, the apparatus comprising a tank to receive the slurry and having a lower part shaped to lead the particles settling therein to an outlet aperture adjacent the bottom of the tank, a passage into which the outlet aperture opens intermediate the ends of the passage, one end of the passage communicating with the tank at a level above that normally occupied by the settled particles but below the surface of the supernatant liquid on the settled particles, and a pump arranged to withdraw the slurry from the tank, the other end of the passage communicating with the pump.
Claim 3
Dependent Claim
26 words
Apparatus according to claim 1 wherein said one end of the passage is formed with a restriction to limit the quantity of liquid entering the passage.
Claim 4
Dependent Claim
30 words
Apparatus according to claim 1 wherein said one end of the passage is provided with a baffle to prevent particles entering said one end as they settle in the tank.
Claim 5
Dependent Claim
28 words
Apparatus according to claim 3 wherein the baffle is in the form of a pair of inclined plates which converge upwardly over said one end of the passage.
Claim 6
Dependent Claim
15 words
Apparatus according to claim 1 wherein the outlet aperture is provided with a removable plug.
Claim 7
Dependent Claim
22 words
Apparatus according to claim 5 including fluid operating means for moving the plug in timed relation with the operation of said pump.
Claim 8
Independent Claim
73 words
A method of circulating a slurry comprising a mixture of liquid and solid particles from a tank in the bottom of which the particles tend to settle with a supernatant layer of liquid, comprising establishing a flow of liquid from a position in the tank above the settled particles but below the surface of the layer and feeding the particles into said flowing liquid at a position adjacent the bottom of the tank.
Claim 9
Independent Claim
73 words
A method of circulating a slurry comprising a mixture of liquid and solid particles from a tank in the bottom of which the particles tend to settle with a supernatant layer of liquid, comprising establishing a flow of liquid from a position in the tank above the settled particles but below the surface of the layer and feeding the particles into said flowing liquid at a position adjacent the bottom of the tank.
Claim 10
Dependent Claim
74 words
A method according to claim 7 wherein said slurry is circulated in a number of operating periods between which are interposed rest periods and comprising the steps of preventing the particles passing into said flowing liquid immediately before the start of the rest period but prior to the cessation of said liquid flow and, at the end of such rest period, commencing said liquid flow prior to feeding the particles into the flowing liquid.
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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |