US PATENT SUBCLASS 516 / 166
.~.~.~.~.~.~.~ The nitrogen is present in the cation of a salt

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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}
166.~.~.~.~.~.~.~ The nitrogen is present in the cation of a salt

DEFINITION

Classification: 516/166

The nitrogen is present in the cation of a salt:

(under subclass 164) Subject matter in which the nitrogen of the organic* compound which contains nitrogen and is the polymeric or resinous reaction product of substituted or unsubstituted phenol with substituted or unsubstituted aldehyde is present in the cation of a salt.

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.