Application of John M. Crockett and Philip M. Hulme

RICH, Judge.

This appeal is from the decision of the Patent Office Board of Appeals affirming the rejection of claims 94, 95 and 96 of appellants’ patent application No. 305,315 entitled “Cast Irons and the Manufacture thereof.” The appealed claims are as follows:

“94. A method for treating gray-iron prior to casting thereof, comprising, establishing a bath of a gray cast iron composition containing iron more than 90%, carbon from 1.7% to 4.5%, silicon from 1.0% to 3.5%, and manganese from 0.1% to 1.0%, injecting into said bath a mixture comprising essentially a major proportion of…