146287-A is referenced by 5 patents.
146,287. Fischer, F. Nov. 13, 1916, [Convention date]. Drawings to Specification. Retorts.-The destructive distillation of coal for the recovery of oil is carried out in rotary retorts containing a heavy iron roller of the same length as the retort. The process may be worked under reduced pressure, and with admission of steam. A coating of semi-coke is formed on the interior surface of the retort, and when the coating begins to collapse the process is completed.