US PATENT SUBCLASS 507 / 216
.~.~.~.~.~ Hydroxyalkylcellulose (e.g., HEC, 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}
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}
214  DF  .~.~.~.~ Polysaccharide is cellulose or derivative thereof {2}
216.~.~.~.~.~ Hydroxyalkylcellulose (e.g., HEC, etc.)

DEFINITION

Classification: 507/216

Hydroxyalkylcellulose (e.g., HEC, etc.):

(under subclass 214) Compositions wherein said cellulose derivative is a hydroxyalkylcellulose (e.g., hydroxyethylcellulose (HEC), etc.).