Derby v. Whitworth

LENROOT, Associate Judge.

This is an interference proceeding wherein the Board of Appeals of the United States Patent Office affirmed a decision of the Examiner of Interferences, awarding priority of invention upon all the counts in issue to appellee. From such decision appellants have appealed to this court.

The invention involved relates to flotation agents and methods of effecting concentration of minerals therewith. The counts are thirty-three in number, of which the following are illustrative:

“I. The method of effecting the concentration of minerals by flotation which comprises adding to…