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  5. 197 F.2d 352 (1952)
 

APPLICATION OF DUPONT

No. 5873.

197 F.2d 352 (1952)

Application of DUPONT et al.

United States Court of Customs and Patent Appeals.

May 28, 1952.

Attorney(s) appearing for the Case

Soans, Pond & Anderson, Chicago, Ill. (Cyril A. Soans, Ernest V. Haines, William E. Anderson, Chicago, Ill., and George R. Jones, Washington, D. C., of counsel), for appellants.

E. L. Reynolds, Washington, D. C. (H. S. Miller, Washington, D. C., of counsel), for the Commissioner of Patents.

Before GARRETT, C. J., and JACKSON, O'CONNELL, JOHNSON, and WORLEY, JJ.

GARRETT, Chief Judge.

This is an appeal from the decision of the Board of Appeals of the United States Patent Office affirming that of the Primary Examiner rejecting the four method claims in appellants' application for patent entitled "Elimination of iron from minerals."

No claim was allowed.

The process defined in the appealed claims is directed to the elimination of iron impurities from phosphate rock,...

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