Multi-chamber test tube

Claim 1

A multi-chambered test tube means of circular cross section comprising: first and second matched separate elongate tubular members of rigid material, each of said members having an open end and elongate side wall means, said side wall means of each said member having a zone adapted for abutting relation; means to hold the tubular members together in abutting relation thereby defining a cylindrical test tube means of circular cross section, said members being of a common length and their respective open ends being in a common plane defining a mouth of the test tube means, when the tubular members are in abutting relation; said normally abutting zones of said side wall means of said members defining a septum of said tube means; a stopper for said test tube means, said stopper having a body with a first and a second end, said first end having a slit extending depthwise toward the second end and said slit being sized and located to receive the septum, said slit separating the body adjacent the first end into a first and a second leg, said legs being sized for snug nesting in the open first and second ends respectively of said tubular members, the body of said stopper adjacent the second end having a diameter larger than the diameter of said first end defining a shoulder to dwell on the open end of the tube means when the legs are in the open ends of said tubular members to limit penetration of said stopper into said tubular member; a central cavity in the stopper body between the ends and intermediate the slit and the second end, and a bifurcated passageway with a first leg path extending from the cavity through the first leg and to the first end of the stopper and a second leg path extending from the cavity through the second leg and to the first end of the stopper; one-way valve means in each of the leg paths and normally closed and yieldable to permit flow through the leg paths in response to an elevated pressure in the cavity relative to the interior of the tube means.