Cell cultivation container

Claim 1

A cell cultivation device whose interior can be sealed with respect to exposure to the surrounding atmosphere or exposed to the surrounding atmosphere via a predetermined cross sectional area, said container device comprising a container element which comprises a container portion defining the interior of said container element and a cylindrical neck portion which terminates in a mouth, said cylindrical neck portion defining an axis therethrough and providing a first zone adjacent to the mouth thereof and a second zone located between the first zone and the container portion, the neck portion along said first zone defining a larger inner diameter than the neck portion along said second zone, said container element also including at least two axially extending projections connected to the neck portion along said first zone so as to extend inwardly of said neck portion, and a screw cover element for attachment to the cylindrical neck portion of said container element, said screw element defining an inner skirt with an outer annular bead, said screw cover element being dimensioned such that when fully tightened over the neck portion of said container element, said outer annular bead will be in sealing engagement with the neck portion of said container element along said second zone of said neck portion, while when in a partially unscrewed position said outer annular bead will engage only the inwardly protruding, axially extending projections connected to the neck portion along said first zone, such that a predetermined cross sectional area for exposure of the interior of said container element and the surrounding atmosphere is provided by said projections between the inner skirt of said screw cover element and the neck portion of said container element along said first zone to which said projections are attached.