Abstract: In a hollow-fiber permeability apparatus in which a permeating region of a housing contains a bundle of hollow fibers, and materials can selectively permeate through the membranes formed by the permeable walls of the hollow fibers, between a fluid flowing along the exteriors of the hollow fibers, and another fluid flowing along the interiors of the hollow fibers, at least one constricted portion directed to the inside of the housing is formed in the sides of the cross-wise cross section of the permeating region, the cross-wise cross-section being substantially perpendicular to the longitudinal direction of the hollow fibers.

Abstract: A vacuum bottle includes a pump dispenser for dispensing liquids from the temperature insulating interior without the need for removing the top or pouring. The pump dispenser employs a manually operated disk to pump air from a diaphragm into the bottle interior where it forces the liquid contents up a fluid tube and out a dispensing spout. A plurality of spaced ribs improve the operation of the dispenser mechanism by preventing twisting of the disk during pumping.