US4806250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid chromatography and apparatus using the same
Assignee: Hitachi Ltd
•
Filing: 1988-02-26
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Granted: 1989-02-21
•
Expires: 2008-02-26
Abstract
Abstract Desired components can be simply and economically separated and recovered from a sample solution having a complicated composition through a liquid chromatography by passing the sample solution through a separation column, thereby separating components contained therein in the separation column, then selectively passing the eluate from the separation column through a trapping column according to a desired component, thereby trapping the desired component in the trapping column, while discarding or recycling the effluent eluate from the trapping column, and then passing another eluting solution composed of a volatile substance when dried under reduced pressure through the trapping column, thereby recovering eluate containing the desired component from the trapping column.
Inventors
- 👤 Yoshinori Takata
- 👤 Mitsuo Ito
- 👤 Junkichi Miura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:35
CPC Classifications
B; B01; B01D; B01D15/00; B01D15/08; B01D15/10; B01D15/24; B01D15/247; B01D15/18; B01D15/1864; B01D15/1871; B01D15/1885; G; G01; G01N; G01N30/00; G01N30/02; G01N30/84; G01N2030/8411; G01N30/80; G01N30/82
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
164 words
A liquid chromatography process for isolating a desired component from a sample solution using a liquid state eluting solution, which comprises passing the sample solution through a separation column, thereby separating components contained therein in the separation column, then selectively eluting a desired component of the components separated in the separation olumn using an eluting solution capable of eluting the esired component from the separating column and nabling the desired component to be retained in a trapping column, passing the eluate containing the desired component from the separation column through a trapping column, thereby trapping the desired component in the trapping column, while discarding or recycling the effluent eluate from the trapping column, and then passing another elution solution composed of a volatile substance when dried under reduced pressure through the trapping column, thereby recovering eluate containing the desired component from the trapping column, wherein the recovered eluate from the trapping column is d under reduced pressure, thereby obtaining the desired component pure form.
Claim 2
Dependent Claim
164 words
A liquid chromatography process for isolating a desired component from a sample solution using a liquid state eluting solution, which comprises passing the sample solution through a separation column, thereby separating components contained therein in the separation column, then selectively eluting a desired component of the components separated in the separation olumn using an eluting solution capable of eluting the esired component from the separating column and nabling the desired component to be retained in a trapping column, passing the eluate containing the desired component from the separation column through a trapping column, thereby trapping the desired component in the trapping column, while discarding or recycling the effluent eluate from the trapping column, and then passing another elution solution composed of a volatile substance when dried under reduced pressure through the trapping column, thereby recovering eluate containing the desired component from the trapping column, wherein the recovered eluate from the trapping column is d under reduced pressure, thereby obtaining the desired component pure form.
Claim 3
Dependent Claim
35 words
A liquid chromatography process according to claim 1, wherein the eluate from the separation column is detected by a detector and an eluate fraction containing detected desirred component is introduced selectively into the trapping column.
Claim 4
Dependent Claim
48 words
A liquid chrom;atography process according to claim 2, wherein the eluate fraction from the separation column is selectively introduced into one of the trapping columns, and the detection and the introduction of the eluate containing the detected desired component into the trapping column are interlocked with each other.
Claim 5
Dependent Claim
52 words
A liquid chromatography process according to claim 2, wherein the eluate fraction from the separation column is selectively introduced into one of the trapping columns, t the introduction of the eluting solution into the apping column and the recovery of the resulting eluate om the trapping column are interlocked with each other.
Claim 6
Dependent Claim
30 words
A liquid chromatography process according to claim 1, wherein the eluting solution for the separation column is an aqueous solution or a buffer solution containing electrolytes. according to claim 1,
Claim 7
Dependent Claim
20 words
A liquid chromatography process wherein packing filled in the separation column is different from packing filled in the trapping column.
Claim 8
Dependent Claim
20 words
A liquid chromatography process wherein packing filled in the separation column is different from packing filled in the trapping 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) | 1992-02-21 | 1992-08-22 | 1993-02-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-21 | 1996-08-22 | 1997-02-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-21 | 2000-08-22 | 2001-02-21 | $7700.00 | Window Closed / Lapsed |