US PATENT SUBCLASS 516 / 167
.~.~.~.~.~.~.~ The compound contains carboxylic acid ester group


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516 /   HD   COLLOID SYSTEMS AND WETTING AGENTS; SUBCOMBINATIONS THEREOF; PROCESSES OF

113  DF  COMPOSITIONS CONTAINING AN AGENT FOR BREAKING (RESOLVING) OR INHIBITING COLLOID SYSTEMS; PROCESSES OF BREAKING (RESOLVING) OR INHIBITING COLLOID SYSTEMS (E.G., GEL BREAKING OR INHIBITING, COAGULATING, FLOCCULATING); PROCESSES OF PREPARING THE COMPOSITIONS {3}
135  DF  .~ Continuous liquid phase colloid system and discontinuous liquid phase (e.g., breaking an emulsion) {4}
139  DF  .~.~ The agent contains material which is different from the primary components of both liquid phases of the emulsion colloid system (i.e., more than only diluting) {2}
141  DF  .~.~.~ Aqueous-petroleum, petroleum-aqueous, aqueous-hydrocarbon, or hydrocarbon-aqueous emulsion systems {2}
143  DF  .~.~.~.~ The agent contains organic compound {5}
161  DF  .~.~.~.~.~ The compound contains nitrogen, except if present solely as NH4+ (e.g., nitroso phenol) {7}
164  DF  .~.~.~.~.~.~ The compound contains polymer of substituted or unsubstituted phenol and substituted or unsubstituted aldehyde {4}
167.~.~.~.~.~.~.~ The compound contains carboxylic acid ester group


DEFINITION

Classification: 516/167

The compound contains carboxylic acid ester group:

(under subclass 164) Subject matter in which the organic* compound which contains nitrogen and is the polymeric or resinous reaction product of substituted or unsubstituted phenol with substituted or unsubstituted aldehyde also contains carboxylic acid ester group.

SEE OR SEARCH THIS CLASS, SUBCLASS:

128+, for similar subject matter related to breaking (resolving) or inhibiting of foams.

164, see the SEARCH CLASS notes concerning polymer art.