US PATENT SUBCLASS 208 / 55
.~.~.~.~.~ Catalytic 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  DF  .~.~.~.~ Second stage is cracking {1}
55.~.~.~.~.~ Catalytic cracking

DEFINITION

Classification: 208/55

(under subclass 54) Processes wherein the cracking operation is promoted by the use of a catalytic material.