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US 4,062,240 AGranted
Dosing device for a liquid chromatograph
AssigneeHewlett-Packard Company
InventorGunter Richard Schaufele
Life of this patent
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Abstract
A dosing device for a liquid chromatograph includes an axially movable shank. The shank is guided in packing sleeves and has a notch or cavity for receiving a sample and transferring it between a sample chamber and a high pressure chamber by axially moving the shank. The high pressure chamber is coupled to the chromatograph flow system between the pump and the column. A shutter is provided for closing the notch. In the closed position, the shutter and the shank together form a smooth common surface.
Claims5
Dosing apparatus for a liquid chromatograph comprising:
- means defining a first sample receiving chamber and an adjacent second chamber connectable between the pump and column of a chromatograph flow system;
- and
- sample transferring means disposed in communication with said first and second chambers, said transferring means including:
- shank means formed to define a sample cavity therein, said shank means being axially movable between said first and second chambers to position said cavity in a selected one of said chambers;
- and
- movable shutter means disposed on said shank for closing said cavity.
3 more elements
Dependencies are inferred from the claim text.