US PATENT SUBCLASS 44 / 622
.~.~ Sulfur

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.~.~ Sulfur {2}
623  DF  .~.~.~> Using a transition metal-containing material
624  DF  .~.~.~> Using liquid aqueous material {1}

DEFINITION

Classification: 44/622

Sulfur:

(under subclass 621) Subject matter wherein sulfur is removed from coal.

SEE OR SEARCH THIS CLASS, SUBCLASS:

604, for a process wherein a material is added to coal to retard escape of sulfur-containing materials with combustion gases, or the product of such a process.