US PATENT SUBCLASS 507 / 217
.~.~.~.~ Polysaccharide is hydroxyalkyl ether derivative (e.g., HPG, etc.)

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


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}
217.~.~.~.~ Polysaccharide is hydroxyalkyl ether derivative (e.g., HPG, etc.)

DEFINITION

Classification: 507/217

Polysaccharide is hydroxyalkyl ether derivative (e.g., HPG, etc.):

(under subclass 211) Compositions wherein the polysaccharide is a hydroxyalkyl ether carbohydrate derivative (e.g., hydroxypropylguar (HPG), etc.).

SEE OR SEARCH THIS CLASS, SUBCLASS:

216, for hydroxyalkylcellulose.