US PATENT SUBCLASS 507 / 212
.~.~.~.~ Polysaccharide is starch or derivative thereof

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}
209  DF  .~.~ Organic component is carbohydrate or derivative thereof (e.g., sugar or gum, such as galactomannan, etc.) or carboxylic acid ester of an alcohol which has five or more hydroxy groups bonded directly to carbons {3}
211  DF  .~.~.~ Carbohydrate is polysaccharide {4}
212.~.~.~.~ Polysaccharide is starch or derivative thereof

DEFINITION

Classification: 507/212

Polysaccharide is starch or derivative thereof:

(under subclass 211) Compositions wherein the polysaccharide is starch or a derivative thereof such as modified starch or cationic starch.