US PATENT SUBCLASS 208 / 74
.~.~.~.~.~ Catalyst in multiple stages

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  DF  .~.~.~.~ Catalyst in at least one stage {1}
74.~.~.~.~.~ Catalyst in multiple stages

DEFINITION

Classification: 208/74

(under subclass 73) Processes wherein at least two of the cracking steps take place in the presence of catalytic material.