Improvements relating to the Manufacture of Coal Tar Compositions and Pitches.

摘要

9322. Lake, H. H., [Warren, F. J.]. April 22. Paving-materials.-Tar and pitch are rendered more suitable for many purposes by causing them to contain a certain proportion of lampblack. For use in making a paving-composition, the tar or pitch may contain as much as 50 per cent. of lampblack. Free lampblack may be added to the tar or pitch, a tar or pitch containing an excess of lampblack may be added to one containing a deficiency thereof, or the process of manufacture of the tar or pitch may be varied to obtain the desired proportion of lampblack therein.