Patent ID: 6499515
Filing Date: 2002-12-31
Classification: F04B,G01F

Abstract:
A gas cushion proportioning microsystem to proportion liquid volumes in the microliter and sub-microliter range, comprising:a liquid reservoir (1) including a storage space (1â€²) for the liquid being proportioned the boundary line of which is broken through by an outwardly leading liquid passage (1â€³) and a gas passage (1IV), a gas displacement system joined to the gas passage (1IV), comprising a gas displacement system which has a micropump (2) to pump a gas and a connection (6) to the gas passage (1IV), and a proportioning control (7) disposed in an operative communication with the micropump (2) and the valve means (4) to close the valve means (4) and generate a negative pressure or positive pressure in the gas reservoir (3) and to apply the negative pressure or positive pressure from the gas reservoir (3) to the liquid reservoir (1) by actuating the valve means (4) in order to receive liquid in the storage space (1â€²) through the liquid passage (1â€³) or to deliver it from said space.