Patent US4824560A successfully refreshed from Google Patents.
US4824560A
Expired / Lapsed
US
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Separation of materials from a liquid dispersion by sedimentation
Assignee: ASSAF SCIENTIFIC DEVELOPMENT Corp Ltd
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Filing: 1986-04-04
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Granted: 1989-04-25
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Expires: 2006-04-04
Abstract
Abstract Sedimentation classification of particulate material in liquid dispersion. The dispersion is centrifuged in a tubular vessel comprising at least two neighboring compartments communicating via at least one opening which may be capillary. The lowermost compartment has a sealed bottom and the uppermost has an open upper end. Upon completion of the centrifugation a liquid fraction with dispersed particulate material is decanted from the uppermost compartment. Useful products may also be recovered from other compartments.
Inventors
- 👤 Benjamin Alspector
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:37
CPC Classifications
B; B04; B04B; B04B5/00; B04B5/04; B04B5/0407; B04B5/0414; B03; B03D; B03D3/00; G; G01; G01N; G01N15/00; G01N15/04; G01N15/042; C; C12; C12M; C12M47/00; C12M47/04
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
164 words
A method of classification by centrifugation of particulate material in liquid dispersion with at least two fractions, characterized by: (i) providing a tubular vessel comprising at least two aligned coaxial compartments with each two neighbouring compartments communicating via at least one opening, said tubular vessel having a first extreme compartment with a sealed bottom and a second extreme compartment with an open end; (ii) charging a working liquid into said tubular vessel via said second extreme compartment thereof so as to fill completely said first extreme compartment, said working liquid having a density intermediate the densities of said at least two particulate material fractions to be classified; (iii) charging said particulate material in liquid dispersion into said vessel via said second extreme compartment; (iv) subjecting the so-charged vessel to centrifugation, thereby to cause a heaviest fraction of said particulate material to migrate axially into said first extreme compartment; and (v) decanting a liquid fraction with particulate material dispersed therein from said second extreme compartment.
Claim 2
Independent Claim
164 words
A method of classification by centrifugation of particulate material in liquid dispersion with at least two fractions, characterized by: (i) providing a tubular vessel comprising at least two aligned coaxial compartments with each two neighbouring compartments communicating via at least one opening, said tubular vessel having a first extreme compartment with a sealed bottom and a second extreme compartment with an open end; (ii) charging a working liquid into said tubular vessel via said second extreme compartment thereof so as to fill completely said first extreme compartment, said working liquid having a density intermediate the densities of said at least two particulate material fractions to be classified; (iii) charging said particulate material in liquid dispersion into said vessel via said second extreme compartment; (iv) subjecting the so-charged vessel to centrifugation, thereby to cause a heaviest fraction of said particulate material to migrate axially into said first extreme compartment; and (v) decanting a liquid fraction with particulate material dispersed therein from said second extreme compartment.
Claim 3
Dependent Claim
14 words
A method according to claim 1 wherein said working liquid has a density gradient.
Claim 4
Dependent Claim
30 words
A method according to claim 1 comprising using a vessel with only two compartments, after sedimentation recovering only the contents of the second extreme compartment and then discarding said vessel.
Claim 5
Dependent Claim
38 words
A method according to claim 1 comprising using a vessel with only two compartments, so designed that said first extreme compartment is adapted for the recovery of its contents, and after sedimentation recovering the contents of each compartment.
Claim 6
Dependent Claim
28 words
A method according to claim 1 comprising using a disassemblable vessel with two or more compartments, disassembling the vessel after sedimentation and recovering the contents of each compartment.
Claim 7
Dependent Claim
18 words
The method of claim 1, wherein said working liquid is miscible with a liquid phase of said dispersion.
Claim 8
Dependent Claim
124 words
A tubular centrifugation vessel for carrying out a method of classifying by centrifugation a particulate material in liquid dispersion, comprising at least two axially-aligned compartments with each two neighbouring compartments communicating via at least one opening, said tubular centrifugation vessel having a first extreme compartment with a sealed bottom and a second extreme compartment with an open end, said at least one opening being of a size to admit in the course of centrifugation the passage of a fraction of the particulate material in liquid dispersion that is being centrifuged, and not admitting passage of the particulate material in liquid dispersion under normal gravitational conditions when a working liquid is charged to a level of said at least one opening, thereby forming a meniscus.
Claim 9
Dependent Claim
124 words
A tubular centrifugation vessel for carrying out a method of classifying by centrifugation a particulate material in liquid dispersion, comprising at least two axially-aligned compartments with each two neighbouring compartments communicating via at least one opening, said tubular centrifugation vessel having a first extreme compartment with a sealed bottom and a second extreme compartment with an open end, said at least one opening being of a size to admit in the course of centrifugation the passage of a fraction of the particulate material in liquid dispersion that is being centrifuged, and not admitting passage of the particulate material in liquid dispersion under normal gravitational conditions when a working liquid is charged to a level of said at least one opening, thereby forming a meniscus.
Claim 10
Dependent Claim
9 words
A vessel according to claim 7 having two compartments.
Claim 11
Dependent Claim
10 words
A vessel according to claim 8 having a removable bottom.
Claim 12
Dependent Claim
58 words
A vessel according to claim 7 being disassemblable and comprising tubular constituent parts, each corresponding to one compartment of the assembled vessel, each two neighbouring parts being adapted for tight interengagement in that a downwardly projecting stud portion of one unit is adapted to be received in a tight fit by an open end of the other unit.
Claim 13
Dependent Claim
19 words
A vessel according to claim 7 comprising a partition between every two neighbouring compartments, having at least one opening.
Claim 14
Dependent Claim
17 words
A vessel according to claim 7 wherein the diameter of any opening does not exceed 10 mm.
Claim 15
Dependent Claim
17 words
A vessel according to claim 12 wherein the diameter of any opening does not exceed 5 mm.
Claim 16
Dependent Claim
14 words
A vessel according to claim 7 wherein the opening is of a capillary nature.
Claim 17
Dependent Claim
15 words
A vessel according to claim 7 wherein every two compartments are separated by porous material.
Claim 18
Dependent Claim
36 words
The tubular vessel of claim 7, additionally comprising a partition situated in said vessel and separating each compartment from the other compartment, and said at least one opening being a capillary bore extending through said partition.
Claim 19
Dependent Claim
17 words
The combination of claim 16, wherein said partition is in the form of a double concave block.
Claim 20
Dependent Claim
29 words
The combination of claim 16, additionally comprising a removable bottom piece enclosing at least a part of said first compartment, whereby contents of the same can be drained off.
Claim 21
Dependent Claim
35 words
The combination of claim 18, wherein said bottom piece comprises a circumferential recess and a remainder of said vessel comprises a projecting stud, with said stud and recess formed to engage in a tight fit.
Claim 22
Dependent Claim
41 words
The combination of claim 18, wherein said removable bottom piece comprises an open upper end, and said partition comprises a projecting stud portion, with said stud portion and upper end of said bottom piece formed to engage in a tight fit.
Claim 23
Dependent Claim
80 words
The combination of claim 20, additionally comprising a third compartment aligned with said first two compartments, a second partition situated to separate said second and third components, and a second capillary bore extending through said second partition and through which said second and third compartments communicate, wherein said second partition comprises a projecting stud portion formed to engage said open end of said second compartment in a tight fit, and said second and third compartments are separable from one another.
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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) | 1992-04-24 | 1992-10-24 | 1993-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-24 | 1996-10-24 | 1997-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-24 | 2000-10-24 | 2001-04-25 | $7700.00 | Window Closed / Lapsed |