Abstract: A dynamic mixer comprising a rotor, which is coupled to a drive shaft and which is rotationally mounted in a mixing chamber provided inside a rotor housing; at least one first and one second constituent can be fed to said mixing chamber; the drive shaft comprises at least one wavy channel via which the second constituent can be introduced into the mixing chamber; the mixing device is simplified since the second constituent is fed through the channel provided in the drive shaft; no separate connection for supplying the second constituent is provided on the rotor housing whereby enabling the rotor housing to have a simple design and be economically produced; the assembly and disassembly of parts are also simplified, particularly of the rotor and rotor housing, which can be disposed of or cleaned after the mixer has been used, allowing the dynamic mixer to be repeatedly reused.

Abstract: An aerating propeller for attaching to the end of a drive shaft includes blades having a chamber to receive a flow of fluids from a conduit in a drive shaft. A trailing face of the blade includes a first opening into the chamber to permit the flow of fluids in the chamber to exit the propeller and a tip of the blade includes a second opening extending into the chamber to permit the flow of fluids in the chamber to exit the propeller. The first opening of the first blade is aligned generally in the same plane with the leading face of the second blade which follows the first blade when the propeller is rotated.

Abstract: A dissolution test apparatus comprises a spindle head assembly interconnected between first and second lateral support members. The lateral support members are translatable along a first axis, and the spindle head assembly is translatable along a second axis, such that the spindle head assembly is movable from a front, operative position at which test procedures are effected, to a rear position at which access to the dissolution test apparatus is enhanced. The spindle head assembly includes a dosage delivery mechanism including an actuatable dosage unit-retaining member. A front portion of the dissolution test apparatus has a tapered width to accommodate a triangular or trapezoidal array of test vessels, resulting in high visibility of the vessels.