Improvements in the preparation of trinidad pitch lake asphalt and the like

摘要

252,802. Pine, J. A. W. March 7, 1925. Asphalt.-Trinidad lake or similar asphalt is pulverized, washed if necessary, compressed into briquettes with a moisture content of about 10 per cent, and dried until a product containing about 6 per cent of water is obtained. The dried briquettes may be transported in bulk, and when required for use are pulverized and mixed with the sand, &c. for producing paving cement.