Patent ID: 7425440

Claim:
A culture flask comprising: a single chamber containing two or more internal chambers of different sizes, said single chamber, defined by two spaced apart parallel major walls joined together by two spaced apart minor parallel walls and a base wall joining together the two major walls and minor walls, said major and minor walls converging from the base wall to form a neck portion having an access port providing access to each of said two or more internal chambers for introduction of cells and culture medium, said two or more internal chambers being defined by at least one internal dividing wall extending partially from one major wall towards the other major wall such that when the flask is lying on the major wall from which the at least one internal dividing wall extends, first and second said internal chambers of different sizes are provided, and when the flask is lying on the opposite major wall, a third said internal chamber is provided that is not divided by the at least one internal dividing wall, and between said first and second internal chambers of different sizes a channel exists for transfer of cells and culture medium from one of said first and second internal chambers to the larger of said first and second internal chambers by the flask being held at a suitable angle.