(under subclass 37) Subject matter for determining through the direct application of fluid under pressure the porosity (i.e., volume of interstices) of solids, the fineness of powdered materials, or action of filters; also, the determining of permeability (i.e., the passage or diffusibility of fluids through a specimen).
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152.05, for determining a characteristic of a formation in a borehole by measuring permeability or porosity.
