US4900446A
Expired / Lapsed
US
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Centrifugal fast chromatograph
Assignee: Large Scale Biology Corp
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Filing: 1989-03-31
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Granted: 1990-02-13
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Expires: 2009-03-31
Abstract
Abstract A centrifugal fast chromatograph is disclosed. The apparatus includes a rotor, a rotor drive, a plurality of chromatographic columns mounted on the rotor, a transfer disk mounted on the rotor, photodetecting apparatus, a gradient maker and a microprocessor control system. The microprocessor controls and monitors the entire chromatography process. The centrifugal fast chromatograph permits the performance of multiple, rapid, and simultaneous separations.
Inventors
- 👤 Norman G. Anderson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:56
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/26; G01N30/38; B; B01; B01D; B01D15/00; B01D15/08; B01D15/10; B01D15/18; B01D15/1864; B01D15/1885; G01N2030/381; G01N30/46; G01N30/466
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
130 words
A method of simultaneously conducting gradient-elution of a plurality of solutions using a centrifugal fast chromatograph having a valve system for reversing flow through columns while maintaining centrifugally-generated pressure and flow comprising the steps of: placing a sample in a transfer disk of a chromatograph rotor; placing gradient solutions in a gradient maker; transferring a gradient from said gradient maker through gradient feed lines, distributor rings, and feed lines, and into chromatographic columns; eluting the samples by the gradient and by rotating said chromatographic columns; monitoring the separated solutions with a photodetector and a light source which detect the state of the solutions through an optical flow cell disposed in each said chromatographic column; and simultaneously controlling, monitoring and recording all aspects of the chromatographic process for said chromatographic columns.
Claim 2
Independent Claim
130 words
A method of simultaneously conducting gradient-elution of a plurality of solutions using a centrifugal fast chromatograph having a valve system for reversing flow through columns while maintaining centrifugally-generated pressure and flow comprising the steps of: placing a sample in a transfer disk of a chromatograph rotor; placing gradient solutions in a gradient maker; transferring a gradient from said gradient maker through gradient feed lines, distributor rings, and feed lines, and into chromatographic columns; eluting the samples by the gradient and by rotating said chromatographic columns; monitoring the separated solutions with a photodetector and a light source which detect the state of the solutions through an optical flow cell disposed in each said chromatographic column; and simultaneously controlling, monitoring and recording all aspects of the chromatographic process for said chromatographic columns.
Claim 3
Dependent Claim
39 words
The method as set forth in claim 1 further comprising the step of: automatically apportioning the sample into multiple streams using stream apportioning blades on said chromatograph rotor, thereby transferring equal amounts of said sample into said chromatographic columns.
Claim 4
Dependent Claim
77 words
The method as set forth in claim 1 further comprising the steps of: introducing a suspension of inert particles to pack a lower cone of said chromatographic columns while center and edge line valves are set for outward flow through said chromatographic columns; packing said chromatographic columns with active particles by centrifugal force; packing an upper cone of said chromatographic columns with inert particles; and setting in place an upper porous plug in each said chromatographic column.
Claim 5
Dependent Claim
30 words
The method as set forth in claim 3 wherein samples are individually injected through self-sealing rubber ports at the centrifugal end while the rotor is at rest to prevent backmixing.
Claim 6
Dependent Claim
38 words
The method as set forth in claim 1 wherein hydrostatic pressure provided by centrifugal force assists packing of said chromatographic columns, loading the sample into said chromatographic columns, separating the samples during elution, and regenerating said chromatographic columns.
Claim 7
Dependent Claim
42 words
The method as set forth in claim 1 wherein the density gradient elution in a centrifugal field is conducted so as to stabilize flow of the sample through said chromatographic columns and prevent anomalous flow including band tilting, band widening, and channeling.
Claim 8
Independent Claim
93 words
A method of simultaneously conducting elution of a plurality of sample solutions using a centrifugal chromatograph having a plurality of rotatable chromatographic columns and a valve system for reversing flow through the columns while maintaining centrifugally-generated pressure and flow comprising the steps of: selectively placing a sample in flow communication with either end of a chromatographic column; selectively placing solutions in flow communication with said chromatographic columns for eluting the sample from said selected end; eluting the sample with the gradient by rotating said chromatographic columns to produce separated solutions in the columns.
Claim 9
Independent Claim
93 words
A method of simultaneously conducting elution of a plurality of sample solutions using a centrifugal chromatograph having a plurality of rotatable chromatographic columns and a valve system for reversing flow through the columns while maintaining centrifugally-generated pressure and flow comprising the steps of: selectively placing a sample in flow communication with either end of a chromatographic column; selectively placing solutions in flow communication with said chromatographic columns for eluting the sample from said selected end; eluting the sample with the gradient by rotating said chromatographic columns to produce separated solutions in the columns.
Claim 10
Dependent Claim
19 words
The method of claim 7 further comprising the step of monitoring the separated solutions to detect the state thereof.
Claim 11
Dependent Claim
25 words
The method of claim 7 further comprising the step of apportioning the sample into multiple streams for flow communication with each of said chromatographic columns.
Claim 12
Dependent Claim
27 words
The method of claim 7 further comprising the step of producing a density gradient in the solution for stabilizing the flow of samples through the chromatographic columns.
Claim 13
Dependent Claim
22 words
The method of claim 7 further comprising the step of preventing regurgitation of the sample and the solution from the chromatographic column.
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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) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |