In re Klosak

Baldwin, Judge.

This appeal is from the decision of the Patent Office Board of Appeals affirming the examiner’s rejection of claims 1-6 of appellant’s •application1 as unpatentable under 85 USC 103. No claims have been allowed.

*863 The Invention

■ TRe claims are directed to a method of producing silica sols by contacting'aqueous solutions.of alkali metal silicates with ion exchange resins. Claim 1 reads as follows (paragraphing ours) :

An improved continuous method for producing colloidal silica sols which comprises the steps of

Contacting an aqueous solution of alkali metal silicate containing at…