(under subclass 355) Apparatus in which the nonliquid means is formed either of at least two slanted plates that are an equal distance apart at every point between which the gaseous fluid mixture or the separated gaseous constituent flows (e.g., louver, etc.) that are constructed to provide substantially constant area for flow of the gaseous fluid mixture or the separated gaseous constituent or of at least two plates that are an equal distance apart at every point between which the gaseous fluid mixture or the separated gaseous constituent flows in a tortuous or sinuous path, the plates being bent, deformed, or provided with projections, and arranged relatively one to the other so that a bend, deformation, or projection of one plate is spaced from the corresponding bend, deformation, or projection of the other, so as to provide substantially constant area for the flow of the gaseous fluid mixture or the separated gaseous constituent.
