US PATENT SUBCLASS 44 / 623
.~.~.~ Using a transition metal-containing material

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}
623.~.~.~ Using a transition metal-containing material

DEFINITION

Classification: 44/623

Using a transition metal-containing material:

(under subclass 622) Subject matter wherein a process includes the use of a free metal or metal compound in which the metal has an inner electron shell, rather than an outer shell, partially filled.

(1) Note. In the periodic table this class of metals includes elements 21 through 30 (scandium through zinc), 39 through 48 (yttrium through cadmium), 57 through 80 (lanthanum through mercury) and 80+ (actinium through the transuranium elements).