US PATENT SUBCLASS 44 / 625
.~.~.~.~ And treatment with gas

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  DF  .~ Removal of undesirable {3}
622  DF  .~.~ Sulfur {2}
624  DF  .~.~.~ Using liquid aqueous material {1}
625.~.~.~.~ And treatment with gas

DEFINITION

Classification: 44/625

And treatment with gas:

(under subclass 624) Subject matter in which the coal is treated also with a gaseous material, prior, subsequent to or concurrently with, the liquid aqueous material.