(under subclass 101) Apparatus which has two or more separate and distinct stages or zones for chromatos:graphic treatment of the plurality of gases where these stages may either be contained within the same column or housed in separate columns.
SEE OR SEARCH THIS CLASS, SUBCLASS:
55+, for apparatus with serially arranged electric field and nonelectrical separators.
121+, for apparatus with plural solid sorbent beds.
134+, for solid sorbent apparatus with plural basically diverse separating means.
SEE OR SEARCH CLASS
95, Gas Separation: Processes,
86, for chromatos:graphic processes using plural separate columns.
