US PATENT SUBCLASS 208 / 151
.~.~.~ Plural stages

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

46  DF  CHEMICAL CONVERSION OF HYDROCARBONS {11}
146  DF  .~ Solids contacting and mixing {8}
150  DF  .~.~ Purging {1}
151.~.~.~ Plural stages

DEFINITION

Classification: 208/151

(under subclass 150) Processes wherein the purging takes place in a series of separate and distinct stages.