RICH, Judge.
This appeal is from the decision of the Patent Office Board of Appeals affirming the rejection of product claim 16, the sole claim on appeal, in appellant's application serial No. 721,293, filed March 13, 1958, entitled "Preparation of Block Polymers," assigned to Phillips Petroleum Company. Twelve process claims were allowed.
The invention relates to block copolymers, hereinafter defined. Claim 16 reads:
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