Application of Sidney Dilnot

MARTIN, Judge.

This is an appeal from a decision of the Board of Appeals of the United States Patent Office regarding appel lant’s application for a patent on “Light Weight Aerated Concrete.” Six claims reciting a method of making this material were allowed by the examiner. The sole issue is the patentability of article claims 10-13 and 20 in view of the Fraser patent, Re. 23,228, issued May 9, 1950.

Claim 10. is representative and reads as follows:

“10. An article of manufacture comprising a form retaining self sustaining body of indurated, dense calcium silicate hydrate matrix, said body…