Patent ID: 6745636
Filing Date: 2004-06-08
Classification: B01L,G01N

Abstract:
An air displacement pipette comprising a pipette tip mounting shaft and a pipette tip including axially spaced and mating annular sealing and lateral support zones and regions respectively, the annular sealing zone comprising an annular sealing surface outward of an outer surface of the mounting shaft at a lower end thereof and a sidewall of the pipette tip in the sealing region being sufficiently thin as to expand slightly and form an interference fit and air tight seal between the sealing surface and the sealing region when the sealing zone penetrates the sealing region and an outer diameter of the mounting shaft in the lateral support zone being equal to or slightly greater than an inner diameter of the pipette tip in the lateral support region to produce an secondary interference fit or air tight seal between the mounting shaft and pipette tip.