Patent ID: 6854877

Claim:
A mixer for an aseptic liquid in a vessel having a wall and having an opening therein and containing the aseptic liquid to be mixed comprising a weldment post extending through the opening in the wall and being adapted to be welded into the wall to form a liquid-tight seal with the wall of the vessel, the weldment post having a distal extremity inside the wall and having a proximal extremity outside the wall, the weldment post having a bore therein extending out through the proximal extremity of the weldment post, a magnet drive assembly disposed in the bore in the weldment post and a drive motor carried by the weldment post for driving the magnet drive assembly, a hub rotatably mounted on the weldment post, impellers mounted on the hub, a magnet driven assembly mounted in the hub and being disposed in close proximity to the magnet drive assembly but being separated therefrom by a liquid-tight seal, said magnet drive assembly having a plurality of circumferentially spaced apart driven permanent magnets and further including means for caging said driven permanent magnets to prevent movement of the driven permanent magnets relative to the hub.