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US2045160A
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Process of treating fresh unused petroleum oils to produce decolorized lubricating oil stocks
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US1904682A
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Process for decolorizing oils
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Process of treating spent adsorbents
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Process of treating spent adsorbents
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US1794874A
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Apparatus for the recovery of solid materials by extraction
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Process of refining oils
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Method of treating adsorbents
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Tipping filter press
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Multidisk suction filter
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Apparatus for clarifying and decolorizing petroleum oil
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US1731702A
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Apparatus for treating clay
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US1989330A
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Process for clarifying and improving the color of hydrocarbon oils
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Method of decolorizing oils at high temperatures
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Method of decolorizing oils under pressure
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Process for refining oils
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Decolorization of hydrocarbons
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US1797715A
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Distillation of hydrocarbons
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Process of revivifying spent clarifying and decolorizing agents
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Method of revivifying spent adsorbents for oil treatments
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US1642871A
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Clarifying and decolorizing agent and process for making the same
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