In re Gemassmer

■ MaRtin, Judge,

delivered the opinion of the court:

This appeal is from a decision of the Board of Appeals affirming the examiner’s rejection of claims 10-20' for PREPARATION OF ORGANIC ISOCYANATES.1 Fifteen claims have been allowed. Claim 10, representative of the appealed claims,2 reads:

10. In a method of preparing aromatic isocyanates by reacting, in an inert organic solvent, a stoichiometric excess of phosgene with a compound selected from the group consisting of aromatic primary mono-, di-, and polyamines having no substituents other than primary amino which are capable of reacting with…