US PATENT SUBCLASS 507 / 107
.~.~.~ Humate component is fossilized (e.g., lignite, leonardite, brown coal, etc.)

Current as of: June, 1999
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507 /   HD   EARTH BORING, WELL TREATING, AND OIL FIELD CHEMISTRY

100  DF  EARTH BORING {4}
103  DF  .~ Contains organic component {14}
106  DF  .~.~ Organic component is lignin or humate or derivative thereof (e.g., tannin, quebracho extract, etc.) {2}
107.~.~.~ Humate component is fossilized (e.g., lignite, leonardite, brown coal, etc.)

DEFINITION

Classification: 507/107

Humate component is fossilized (e.g., lignite, leonardite, brown coal, etc.):

(under subclass 106) Composition wherein the humate component is fossilized (e.g., lignite, leonardite, brown coal, ASTM Type IV coal, etc.).

(1) Note. Included in this subclass is a fossilized humate component grafted onto a polymer or resin.