EP0035394A2
Expired / Lapsed
EP
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Apparatus for field flow fractionation
Assignee: EIDP Inc
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Filing: 1981-02-27
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Granted: —
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Expires: 2001-02-27
Abstract
Abstract A long, thin annular belt-like channel is shown for use in sedimentation field flow fractionation. This channel, which may be contained in the rotor of a centrifuge, has a generally rectangular cross-section and inner and outer walls 22, 23. It has an inlet tube 100 which extends through the inner channel wall 23 and is positioned to introduce particulates 25 (including particles and/or macromolecules) approximately at the radial distance 1 from the outer wall where 1 is the equilibrium distance resulting from the average force field exerted on each particulate by the centrifugal force field and by the opposing normal diffusion forces due to Brownian motion. An outlet tube 104 for the channel is similarly located. A modified design tapers the channel at the inlet and/or outlet.
Inventors
- 👤 John Wallace Grant
- 👤 Wallace Wen-Chuan Yau
- 👤 Joseph Jack Kirkland
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 12:20
CPC Classifications
B; B04; B04B; B04B5/00; B04B5/04; B03; B03B; B03B5/00; B04B5/0442; B04B2005/045; G; G01; G01N; G01N30/00; G01N30/0005; G01N2030/0015; G01N2030/002
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
132 words
Apparatus for separating particulates suspended in a fluid medium according to their effective masses, said apparatus having an annular cylindrical channel with a cylinder axis, means for rotating said channel about said axis, means for passing said fluid medium circumferentially through said channel, and means for introducing a sample of said particulates into said medium for passage through said channel, wherein said channel is generally rectangular in cross section, having radially inner and outer walls and inlet and outlet ends, and has an inlet positioned to introduce said particulates approximately at a radical distance 1 inwardly from the outer wall, where 1 is the point of equilibrium between the average force field exerted on each particulate by the rotational centrifugal force and by the normal opposing diffusion forces due to Brownian motion.
Claim 2
Dependent Claim
132 words
Apparatus for separating particulates suspended in a fluid medium according to their effective masses, said apparatus having an annular cylindrical channel with a cylinder axis, means for rotating said channel about said axis, means for passing said fluid medium circumferentially through said channel, and means for introducing a sample of said particulates into said medium for passage through said channel, wherein said channel is generally rectangular in cross section, having radially inner and outer walls and inlet and outlet ends, and has an inlet positioned to introduce said particulates approximately at a radical distance 1 inwardly from the outer wall, where 1 is the point of equilibrium between the average force field exerted on each particulate by the rotational centrifugal force and by the normal opposing diffusion forces due to Brownian motion.
Claim 3
Dependent Claim
20 words
Apparatus as claimed in claim 1 wherein said channel also has an outlet positioned approximately at said radial distance 1.
Claim 4
Dependent Claim
26 words
Apparatus as claimed in claim 2 wherein said outlet is in the form of a radially oriented tube directed through the inner wall of said channel.
Claim 5
Dependent Claim
36 words
Apparatus as claimed in claim 2 wherein said outlet is defined by the 'inner wall of said channel being tapered toward said outer wall whereby the radial thickness of said channel is reduced at said outlet.
Claim 6
Dependent Claim
27 words
Apparatus as claimed in any preceding claim wherein said inlet is in the form of a radially oriented tube directed through the inner wall of said channel.
Claim 7
Dependent Claim
40 words
Apparatus as claimed in any of claims 1 to 4 wherein said inlet is defined by the inner wall of said channel being tapered toward said outer wall whereby the radial thickness of said channel is reduced at said inlet.
Claim 8
Dependent Claim
20 words
Apparatus as claimed in claim 4 or 6 wherein said radial thickness is reduced by a factor of about 10.
Claim 9
Dependent Claim
26 words
Apparatus according to any preceding claim wherein 1 is in the range of about 0.1 to 0.5 W, where W is the thickness of said channel.
References Cited (Backward Citations)
No citation records indexed.
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