US PATENT SUBCLASS 208 / 58
.~.~ First stage is hydrocracking (includes hydro-desulfurization under cracking conditions)

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}
58.~.~ First stage is hydrocracking (includes hydro-desulfurization under cracking conditions) {3}
59  DF  .~.~.~> Hydrocracking in all stages
60  DF  .~.~.~> With subsequent reforming
61  DF  .~.~.~> With subsequent thermal or catalytic cracking

DEFINITION

Classification: 208/58

(under subclass 49) Processes wherein mineral oil is subjected to a cracking step in the presence of hydrogen prior to any other conversion step.

(1) Note. For the purpose of classification in this and indented subclasses those plural stage conversions which include processes of desulfurizing mineral oils in the presence of hydrogen are classified herein if the hydrode sulfurization is carried out under conditions which cause cracking of the mineral oil.