Patents of Interest to Builders.

Progress, Volume XVII, Issue 3, 1 November 1921, Page 72

Patents of Interest to Builders.

Wood, etc., Preserving Gomposition.—A patent, No. 45,616, has been taken out, which comprises a mixture of ammoniacal metallic solutions and antiseptic or preservingsubstances, but its essential feature with regard to known compositions is that it is a mixture of phenol and ammoniacal solutions of metal hydrates and formates. The composition preferably used comprises an ammoniacal solution of copper hydrate, an ammoniacal solution of zinc formate, and an ammoniacal solution of phenol, the ammonia being sufficiently in excess to keep the whole in solution after it is diluted. The percentage of metals (copper and zinc) of this composition is preferably about 6 per cent., and that of phenol is about 8 per cent.