In re Walch

This is an appeal from a decision of tire 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 constituents is a relatively free flowing liquid and) the other of the heavier constituents is a relatively viscous material, which.' comprises…