US PATENT SUBCLASS 196 / 106
.~.~ Series stills
Current as of: June, 1999
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(under subclass 105) A plurality of mineral-oil vaporizers connected in series, so that the oil being distilled passes from one vaporizer to the next.
SEE OR SEARCH CLASS
159, Concentrating Evaporators,
202, Distillation: Apparatus,
173, for a separatory distillation system having a plurality
of stills in series. 203, Distillation: Processes, Separatory,
71, for a separatory distillation process including a series of distillation steps.
208, Mineral Oils: Processes and Products,
49, and subclass 350 for processes including plural serial stages of mineral oil conversions or distillations, respectively.