US PATENT SUBCLASS 507 / 206
.~.~ Organic component is lignin or humate or derivative thereof (e.g., tannin, quebracho extract, etc.)

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

200  DF  WELL TREATING {4}
203  DF  .~ Contains organic component {17}
206.~.~ Organic component is lignin or humate or derivative thereof (e.g., tannin, quebracho extract, etc.) {1}
207  DF  .~.~.~> Lignin or humate component contains sulfur or is reacted with substance containing sulfur (e.g., lignosulfonate, etc.) {1}

DEFINITION

Classification: 507/206

Organic component is lignin or humate or derivative thereof (e.g., tannin, quebracho extract, etc.):

(under subclass 203) Compositions which contain a lignin or a humate component comprising humic or polyphenolic containing substances or derivatives thereof (e.g., lignite, leonardite, tannins, lignins, quebracho extract, pulp liquor, brown coal, etc.).

(1) Note. Included in this subclass is a graft copolymer comprising a lignin or humate component grafted onto a polymer or resin.