US PATENT SUBCLASS 208 / 53
.~.~.~ First stage is coking

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

46  DF  CHEMICAL CONVERSION OF HYDROCARBONS {11}
49  DF  .~ Plural serial stages of chemical conversion {6}
50  DF  .~.~ Coking in at least one stage {3}
53.~.~.~ First stage is coking {1}
54  DF  .~.~.~.~> Second stage is cracking {1}

DEFINITION

Classification: 208/53

(under subclass 50) Processes wherein the coke producing conversion occurs prior to any other conversion of the mineral oil.