GRAHAM, Presiding Judge.
This is an appeal from the decision of the Board of Appeals of the United States Patent Office affirming the decision of the primary examiner rejecting claims 25 and 26 of the appellant's application for patent on an alleged new and useful method of refining rosin esters. The appellant's method is fairly well described in the rejected claims, which are as follows:
"25. The method of refining an abietic acid ester containing latent...
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