US PATENT SUBCLASS 208 / 72
.~.~.~ Cracking in all 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.~.~.~ Cracking in all stages {4}
73  DF  .~.~.~.~> Catalyst in at least one stage {1}
75  DF  .~.~.~.~> With cracking of total product from first stage
76  DF  .~.~.~.~> With cracking of the first stage bottoms
77  DF  .~.~.~.~> With cracking of the first stage intermediate fraction

DEFINITION

Classification: 208/72

(under subclass 67) Processes wherein the mineral oil is subjected only to a plurality of stages of cracking reactions, either thermal or catalytic.

SEE OR SEARCH THIS CLASS, SUBCLASS:

52, and 53+, for processes wherein the oil is subjected to combinations of cracking reactions in series, at least one of

which results in the production of product coke.