US PATENT SUBCLASS 208 / 54
.~.~.~.~ Second stage is cracking

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  DF  .~.~.~ First stage is coking {1}
54.~.~.~.~ Second stage is cracking {1}
55  DF  .~.~.~.~.~> Catalytic cracking

DEFINITION

Classification: 208/54

(under subclass 53) Processes wherein the coke producing conversion is followed by a cracking operation in which no product coke is produced.