Liquid transfer device

A liquid transfer device comprising a housing, said housing having an enclosing top and sides, said housing being open at the bottom, a flexible thin inelastic membrane covering said bottom, said housing defining a space, fluid pressure changing means in operable communication with said space in said housing for reducing or increasing the fluid pressure in said space, said thin inelastic membrane having a plurality of blister-like projections arranged in rows lengthwise and crosswise thereon with relatively small planar web areas of said thin inelastic membrane between each of said blister-like projections, a lower carrier means positioned under said flexible thin inelastic membrane, said lower carrier being mounted with a plurality of pipettes perpendicular to said thin inelastic membrane, each of said pipettes terminating in an open proximal end, having a rim each of which is respectively aligned with an individual blister-like projection, said rims of said pipettes being affixed to portions of said small planar web areas, said blister-like projection extending into said proximal end of said pipette when said space of said housing is under a first fluid pressure gradient and said blister-like projection is everted from said proximal end of said pipette when said fluid pressure gradient is reduced.