Application of Hollingsworth

WORLEY, 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 in rejecting, as unpatentable over the prior art, all of the claims, Nos. 3, 4, 6, 9, and 14, in appellant’s application for a patent for an alleged invention relating to “Deflu-orination of Phosphate Rock;”

Claim 3 is sufficiently illustrative of the appealed claims. It reads:

“3. ■ In the method of defluorinating a phosphate rock in which the rock is subjected to a two-stage calcination in the presence of water vapor with a first stage…