BUFFINGTON, Circuit Judge.
This case concerns the recovery, by a single distillation of crude petroleum, of its by-products. The recovery of such by-products by successive distillations was well known, but this patent concerns the obtaining of such by-products by a single, as compared with recovery by additional, successive, distillation.
In a general way we may say that distillation is effected by the fact that crude petroleum vaporizes at different degrees...
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