US PATENT SUBCLASS 208 / 52 CT
.~.~.~.~ Catalyst treatment to remove metal contaminants

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}
52 R  DF  .~.~.~ With both catalytic and thermal cracking {1}
52 CT.~.~.~.~ Catalyst treatment to remove metal contaminants

Unofficial Alpha Subclasses: R CT

DEFINITION

Classification: 208/52

(under subclass 50) Processes including also at least one stage of catalytic cracking and at least one stage of thermal cracking (not coke forming) in addition to the coke producing conversion step.

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72+, for processes in which a mineral oil is subjected only to successive stages of cracking.