4. Mineral oils: processes and products
  5. By treatment of solid mineral, e.g., coal liquefaction, etc.
  6. Specified agitation or circulation in gas contact zone
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Coal extraction

Mineral oils: processes and products – By treatment of solid mineral – e.g. – coal liquefaction – etc. – Specified agitation or circulation in gas contact zone
Patent

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Coking apparatus and process for oil-containing solids

Mineral oils: processes and products – By treatment of solid mineral – e.g. – coal liquefaction – etc. – Specified agitation or circulation in gas contact zone
Reexamination Certificate

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Conditioning of recycle shale in retorting process

Mineral oils: processes and products – By treatment of solid mineral – e.g. – coal liquefaction – etc. – Specified agitation or circulation in gas contact zone
Patent

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