Thus, while not limiting the invention to use with an indirect,
belt drive impeller, the embodiment presented is presently preferred
for the economic and manufacturing advantages it offers.
U.S. Patent Application 0030157396:
While not limiting the invention, the flow channels may also
minimize buildup of pressure by allowing liquid that accumulates
at the interface between the cathode catalyst and the cathode
microporous backing layer 11, an outlet, so that hydrostatic
pressure that could be created by such liquid does not build up.
