US3791522A
Expired / Lapsed
US
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Chromatographic ready-for-use columns
Assignee: Merck Patent GmbH
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Filing: 1972-06-20
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Granted: 1974-02-12
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Expires: 1992-06-20
Abstract
Abstract A ready-to-use chromatographic column packed with an adsorbent and both ends of which narrow into a shorter column having a smaller diameter into which is fitted a distributing filter, which is tightly packed against the adsorbent; a bored stopper, which is positioned against the distributing filter; and a capillary tube fitted in the bore of the stopper, one end of which extends beyond the end of the shorter column and the other in the interior of the bored stopper. These columns are convenient devices for adsorption and partition chromatography.
Inventors
- 👤 F Eisenbeiss
- 👤 S Ehlerding
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:46
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/60; G01N30/6004; G01N30/6017; G01N30/6034; G01N30/6052; G01N30/6065; G01N30/6082
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
111 words
A ready-for-use chromatographic column comprising a main column packed with a chromatographic adsorbent, each end of the main column communicating via a conical passage with a shorter column of smaller diameter, a distributing filter fitted in each of the shorter columns and tightly packed against the adsorbent, and a bored stopper, at least the center portion of which is fitted with elastic lips, fitted in the end of each of the shorter columns against the distributing filter therein, and a capillary tube fitted in the bore of each stopper, one end thereof extending beyond the end of the shorter column and the other end terminating in the interior of the stopper.
Claim 2
Dependent Claim
111 words
A ready-for-use chromatographic column comprising a main column packed with a chromatographic adsorbent, each end of the main column communicating via a conical passage with a shorter column of smaller diameter, a distributing filter fitted in each of the shorter columns and tightly packed against the adsorbent, and a bored stopper, at least the center portion of which is fitted with elastic lips, fitted in the end of each of the shorter columns against the distributing filter therein, and a capillary tube fitted in the bore of each stopper, one end thereof extending beyond the end of the shorter column and the other end terminating in the interior of the stopper.
Claim 3
Dependent Claim
30 words
A column according to claim 1 wherein the ratio of the diameter of the main column to the diameter of each of the shorter cOlumns is from 2:1 to 5:1.
Claim 4
Dependent Claim
18 words
A column according to claim 1 wherein the conical passages have an inclination of from 15* to 60*.
Claim 5
Dependent Claim
34 words
A column according to claim 1 wherein the capillary tubes are rigidly mounted in the bored stoppers with one end thereof terminating at least 1 mm. from the interior face of the bored stopper.
Claim 6
Dependent Claim
32 words
A column according to claim 4 wherein each of the shorter columns is further sealed near the open end thereof by a plug through which the capillary in the shorter column extends.
Claim 7
Dependent Claim
20 words
A column according to claim 1 wherein the inner diameter of the capillary tubes is from 0.3 to 2 mm.
Claim 8
Dependent Claim
17 words
A column according to claim 1 wherein the distributing filter is formed of a porous ceramic material.
Claim 9
Dependent Claim
15 words
A column according to claim 1 wherein the distributing filter is formed of filter cardboard.
Claim 10
Dependent Claim
18 words
A column according to claim 1 wherein the column is symmetrical in both its transverse and longitudinal axes.
Claim 11
Dependent Claim
70 words
A column according to claim 5 wherein the ratio of the diameter of the main column to the diameter of each of the shorter columns is from 2:1 to 5:1, wherein the conical passages have an inclination of from 15* to 60*, wherein the inner diameter of the capillary tubes in from 0.3 to 2 mm, and wherein the distributing filter if formed of porous ceramic material or filter cardboard.
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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |