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George Herbert Grey
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18,302. Grey, G. H., [Hayward, J. W.]. Aug. 25. Asphalts. - Ground limestone is mixed with petroleum residue, and the mixture subjected to t h e oxidizing action of air, ozonized air, ozone, or oxygen to form an artificial asphalt. The materials are placed in a retort A, heated by gas or otherwise and turning upon a fixed tubular shaft C blocked at one point by a plug a. The air &c. is forced through the branch pipes K into the mixture and passes away by the pipe L. The oxidized material is drawn off at B'. The petroleum residue may be oxidized prior to its admixture with the limestone.
GB189818302D1898-08-251898-08-25Improvements in the Manufacture of Artificial Asphalt, and in Apparatus to be Employed therein.
ExpiredGB189818302A
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