US PATENT SUBCLASS 208 / 261
.~.~.~.~ Vapor phase treatment

Current as of: June, 1999
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208 /   HD   MINERAL OILS: PROCESSES AND PRODUCTS

177  DF  REFINING {23}
255  DF  .~ Gum or gum former removal {2}
257  DF  .~.~ With metal or metal compound {3}
260  DF  .~.~.~ Clay type or alumina {1}
261.~.~.~.~ Vapor phase treatment

DEFINITION

Classification: 208/261

(under subclass 260) Processes wherein the oil is in the vapor state when contacted with the clay or alumina.