US PATENT SUBCLASS 44 / 621
.~ Removal of undesirable

Current as of: June, 1999
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44 /   HD   FUEL AND RELATED COMPOSITIONS

620  DF  COAL TREATING PROCESS OR PRODUCT THEREOF {1}
621.~ Removal of undesirable {3}
622  DF  .~.~> Sulfur {2}
626  DF  .~.~> Water (e.g., drying, etc.)
627  DF  .~.~> Ash or ash-former

DEFINITION

Classification: 44/621

Removal of undesirable:

Subject matter under subclasses 620 wherein the coal is purified.

SEE OR SEARCH CLASS

201, Distillation: Processes, Thermolytic,

17, for such a process which includes refining the resulting char.