US PATENT SUBCLASS 208 / 421
.~.~ Containing Group VI transition metal

Current as of: June, 1999
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208 /   HD   MINERAL OILS: PROCESSES AND PRODUCTS

400  DF  BY TREATMENT OF SOLID MINERAL, E.G., COAL LIQUEFACTION, ETC. {13}
419  DF  .~ Using specifically added catalyst during hydrogenation {3}
421.~.~ Containing Group VI transition metal {1}
422  DF  .~.~.~> And Group VIII metal

DEFINITION

Classification: 208/421

Containing Group VI transition metal:

(under subclass 419) Subject matter in which the catalyst contains one or more of chromium, molybdenum or tungsten in free or combined form.