US PATENT SUBCLASS 44 / 627
.~.~ Ash or ash-former

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}
627.~.~ Ash or ash-former

DEFINITION

Classification: 44/627

Ash or ash-former:

(under subclass 621) Subject matter wherein incombustible materials are removed from coal, generally noncarbonaceous, earthy, materials.