Patent ID: 6248295
Filing Date: 2001-06-19
Classification: B01L

Abstract:
An air displacement pipette comprising:a pipette tip mounting shaft and a pipette tip including axially spaced and mating annular sealing and frusto-conical inwardly and downwardly tapering lateral support zones and regions, respectively, the annular sealing region comprising an annular sealing surface inward of a sidewall of the pipette tip which in the sealing region is sufficiently thin as to expand slightly to form an interference fit and air tight seal between the sealing surface and the sealing zone on the mounting shaft when the sealing zone penetrates the sealing region and the shaft having outer diameters within the inwardly and downwardly tapering lateral support zone which are slightly less than or substantially equal to corresponding uniform inner diameters within the axially tapering lateral support region thereby allowing some contact between the lateral support zone and regions without creating a secondary air tight seal; andmeans for insuring uniform depth of mounting shaft penetration into the pipette tip to maintain a uniform tip interference with the mounting shaft as successive tips are mounted on and ejected from the mounting shaft.