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US 4,293,415 AGranted
Silica chromatographic column
AssigneeHewlett-Packard Company
InventorsPaul F. Bente, III, Ernest H. Zerenner, Raymond D. Dandeneau
Life of this patent
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Abstract
An open tubular or capillary chromatographic column made from drawn silica tubing having an exterior coating for protection from abrasion and moisture and means for holding it in a desired configuration.
Claims23
A chromatographic column for separating components of sample material flowing through it, comprising
- a hollow tube of drawn silica of thin wall construction with a high degree of flexibility,
- the inner surface of said tube being coated with a stationary phase material and there being an unobstructed passage along the axis of the tube, and
- a coating formed on the outer surface of the tube as it is drawn for protecting the said outer surface from abrasion and moisture.
A capillary chromatographic column, comprising
- a hollow tube of drawn silica,
- the inner surface of said tube having been deactivated,
- a coating of stationary phase material on said deactivated inner surface, there being an unobstructed passage along the axis of the tube, and
- a coating formed on the outer surface of the tube for protecting it from abrasion and moisture so that it is sufficiently flexible to be easily formed by hand into a coil having a diameter of 10 centimeters.
1 more element
Tubing for a capillary chromatographic column, comprising
- a hollow tube of drawn quartz,
- stationary phase material coated along the inner surface of said tube, there being an unobstructed passageway along the axis of said tube,
- a coating formed on the outside surface of said tube as it is drawn that protects said outside surface from moisture and abrasion,
- the inner diameter of said tube being such as to provide desired chromatographic performance, and
- the outer diameter of said tube being less than 2.0 millimeters by an amount providing a wall thickness that permits coiling the tube by hand into a coil having a diameter of 15 centimeters.
2 more elements
A capillary chromatographic column comprising
- a hollow tube of drawn silica having an inner diameter within the range of 0.1 mm to 0.4 mm and an outer diameter within the range of 0.15 mm to 1.0 mm,
- the inner surface of said tube being coated with a stationary phase, and
- the outer surface of said tube having a coating formed thereon for protecting it from abrasion and moisture, whereby the column can be formed by hand into a coil having a diameter of 10 centimeters.
Dependencies are inferred from the claim text.