Application of William D. Lawther

MARTIN, Judge.

This is an appeal from a decision of the Board of Appeals affirming the examiner’s rejection of claims 14-18 of appellant’s application serial No. 683,475 filed September 12, 1957 for improvements in shell molding. No claim has been allowed.

Appellant’s application relates to a material for making shell molds and cores for producing metal castings. Shell molds and cores are said to be generally formed of a mixture of molding-sand particles and thermosetting phenolic resins. The resins may be of the one-stage or two-stage types and are prepared by refluxing together phenol and a…