US3620442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifuge slurry supply
Assignee: Combustion Engineering Inc
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Filing: 1969-03-17
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Granted: 1971-11-16
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Expires: 1989-03-17
Abstract
Abstract A centrifuge of the type which has a central slurry feed pipe, a rotating bowl, and a concentric conveyor which includes a tubular shaft with a helix on the outside. The shaft has rectangular openings in the area of the slurry feed with rectangular orifice plates of hardened material fastened inside the shaft. The orifice plate is sealed to the shaft so that it forms a lip, retaining a pool of slurry within the shaft. The orifice plate is also smaller than the opening and overlaps the trailing edge of the opening.
Inventors
- 👤 John J Halloran Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:34
CPC Classifications
B; B04; B04B; B04B1/00; B04B1/20; B04B2001/2033
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
121 words
A centrifuge for separating a slurry into its solid and liquid components comprising: a centrally located slurry feed pipe; a rotating bowl concentric with said feed pipe; a rotating conveyor within said bowl and concentric of said slurry feed pipe which rotates at a speed slightly different than said bowl, said conveyor having a generally impervious tubular shaft and having on the outer portion of said shaft means to urge solids longitudinally along said bowl; said feed pipe feeding slurry to the interior of said shaft at a feed location; said shaft having openings therethrough in the area of the feed location; and said openings having at least a trailing edge generally linear and parallel to the axis of said shaft.
Claim 2
Dependent Claim
121 words
A centrifuge for separating a slurry into its solid and liquid components comprising: a centrally located slurry feed pipe; a rotating bowl concentric with said feed pipe; a rotating conveyor within said bowl and concentric of said slurry feed pipe which rotates at a speed slightly different than said bowl, said conveyor having a generally impervious tubular shaft and having on the outer portion of said shaft means to urge solids longitudinally along said bowl; said feed pipe feeding slurry to the interior of said shaft at a feed location; said shaft having openings therethrough in the area of the feed location; and said openings having at least a trailing edge generally linear and parallel to the axis of said shaft.
Claim 3
Dependent Claim
11 words
An apparatus as in claim 1 wherein said openings are rectangular.
Claim 4
Dependent Claim
20 words
AN apparatus as in claim 2 having rectangular orifice members fastened inside said shaft at the location of said openings.
Claim 5
Dependent Claim
39 words
An apparatus as in claim 3 wherein said orifice members are fastened to the inside of said bowl in a fluidtight manner whereby the orifice effectively forms a dam resulting in a rotating pool of slurry within said shaft.
Claim 6
Dependent Claim
18 words
An apparatus as in claim 3 wherein said orifice members overlap said openings on the trailing edge thereof.
Claim 7
Dependent Claim
24 words
An apparatus as in claim 5 wherein said orifice openings have a length longitudinal to the shaft greater than the width of the opening.
Claim 8
Dependent Claim
16 words
An apparatus as in claim 6 wherein said openings are longitudinally offset relative to one another.
Claim 9
Dependent Claim
37 words
An apparatus as in claim 1 having orifice members fastened inside said shaft at the location of said openings, said orifice having at least a trailing edge generally linear and parallel to the axis of said shaft.
Claim 10
Dependent Claim
39 words
An apparatus as in claim 8 wherein said orifice members are fastened to the inside of said bowl in a fluidtight manner whereby the orifice effectively forms a dam resulting in a rotating pool of slurry within said shaft.
Claim 11
Dependent Claim
18 words
An apparatus as in claim 8 wherein said orifice members overlap said openings on the trailing edge thereof.
Claim 12
Dependent Claim
16 words
An apparatus as in claim 1 wherein said openings are longitudinally offset relative to one another.
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) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |