Patent ID: 7861854

Claim:
A cartridge unit for a multi-compartment container assembly, the cartridge unit comprising: a substantially cylindrical housing having a sealable opening at its top end and an opening at its bottom end; a displaceable member disposed in said sealable opening in the top end of said housing, said displaceable member having a sealable opening at its top end, sealable with a closure member, said displaceable member being adapted and configured to seal said sealable opening of said housing; an inwardly extending annular shoulder, said annular shoulder having an annular internal wall, and defining a flow passage along a longitudinal axis of the cartridge unit; a sealing member adapted for a sealing engagement with said internal wall of said annular shoulder for sealing said flow passage, thereby defining a bottom wall of a compartment in the cartridge unit; said displaceable member being axially displaceable between two positions along said longitudinal axis through the cartridge unit, a first position whereby a seal is formed between said sealing member and the internal wall of said annular shoulder, and a second position in which said sealing member and said internal wall are disengaged, whereby the compartment inside the cartridge unit is in flow communication with the bottom open end of the housing.