US PATENT SUBCLASS 507 / 218
.~.~.~ Ester is higher fatty or carboxylic acid ester (e.g., sorbitan oleate, 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}
218.~.~.~ Ester is higher fatty or carboxylic acid ester (e.g., sorbitan oleate, etc.)

DEFINITION

Classification: 507/218

Ester is higher fatty or carboxylic acid ester (e.g., sorbitan oleate, etc.):

(under subclass 209) Compositions wherein the ester is a higher fatty or carboxylic acid ester of an alcohol having five or more hydroxy groups bonded directly to carbons.

(1) Note. A higher fatty acid denotes a monocarboxylic acid containing an unbroken chain of at least seven carbon atoms bonded to a carboxyl group.