US PATENT SUBCLASS 507 / 213
.~.~.~.~ Polysaccharide is a xanthan (e.g., scleroglucans, 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}
213.~.~.~.~ Polysaccharide is a xanthan (e.g., scleroglucans, etc.)

DEFINITION

Classification: 507/213

Polysaccharide is a xanthan (e.g., scleroglucans, etc.):

(under subclass 211) Compositions wherein the polysaccharide is a xanthan such as scleroglucan, etc.

(1) Note. Xanthans are polysaccharide gums composed of D-glucosyl, D-mannosyl, and D-glucosyluronic acid residues and differing proportions of O-acetyl and pyruvic acid acetal. The primary structure consists of a cellulose backbone with trisaccharide side chains, with the repeating unit being a pentasaccharide.