Sample injection valve for high-performance liquid...

Measuring and testing – Liquid analysis or analysis of the suspension of solids in a... – Content or effect of a constituent of a liquid mixture

Reexamination Certificate

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C073S863720

Reexamination Certificate

active

06874354

ABSTRACT:
The sample injection valve for high-performance liquid chromatography (HPLC) devices comprises a stator with inlets for the sample and the mobile phase, outlets leading to the chromatography column and to a waste collector, as well as connections for both ends of a sample loop. Its rotor has the customary connection channels. An additional washing liquid inlet (7) opens into the connecting channel (9) that, in one valve position, connects the sample inlet (1) to the outlet (2) leading to the waste collector. This enables the sample inlet and the pipette or syringe located therein to be rinsed.

REFERENCES:
patent: 3630371 (1971-12-01), Hrdina
patent: 4444066 (1984-04-01), Ogle et al.
patent: 4811611 (1989-03-01), Uffenheimer
patent: 5194226 (1993-03-01), Tomoff et al.
patent: 5308774 (1994-05-01), Miura et al.
patent: 6012487 (2000-01-01), Hauck
patent: 6260407 (2001-07-01), Petro et al.
patent: 0360604 (1990-03-01), None

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