LENROOT, Associate Judge.
This is an appeal from a decision of the Board of Appeals of the United States Patent Office, affirming a decision of the Examiner, rejecting, for lack of invention over the cited prior art, claim 16 of appellants' application. Other claims were also involved in said decisions, but this appeal relates only to claim 16, which reads as follows: "16. The process of separating a mixture of more than two constituents of which one of the heavier...
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