US PATENT SUBCLASS 208 / 73
.~.~.~.~ Catalyst in at least one stage

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}
67  DF  .~.~ First stage is thermal or catalytic cracking {4}
72  DF  .~.~.~ Cracking in all stages {4}
73.~.~.~.~ Catalyst in at least one stage {1}
74  DF  .~.~.~.~.~> Catalyst in multiple stages

DEFINITION

Classification: 208/73

(under subclass 72) Processes wherein at least one of the cracking steps takes place in the presence of catalytic material.

SEE OR SEARCH THIS CLASS, SUBCLASS:

52, and 55, for combinations of catalytic cracking operations which also include a coking step.