US PATENT SUBCLASS 516 / 171
.~.~.~.~.~.~.~ The compound contains plural -C(=O)NHH where substitution may be made for the hydrogen (e.g., urea formaldehyde)


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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}
169  DF  .~.~.~.~.~.~ The compound contains -C(=O)NHH where substitution may be made for the hydrogen {3}
171.~.~.~.~.~.~.~ The compound contains plural -C(=O)NHH where substitution may be made for the hydrogen (e.g., urea formaldehyde) {1}
172  DF  .~.~.~.~.~.~.~>.~ The compound contains plural nitrogen containing mers* bonded directly to each other (e.g., acylated polyamine, polyamide)


DEFINITION

Classification: 516/171

The compound contains plural -C(=O)NHH where substitution may be made for the hydrogen (e.g., urea formaldehyde):

(under subclass 169) Subject matter in which the organic* compound which contains -C(=O)NHH group where substitution may be made for the hydrogen contains 2 or more such C(=O)NHH groups where substitution may be made for the hydrogen.

(1) Note. The plural -C(=O)NHH groups do not have to be bonded directly to each other.

SEE OR SEARCH THIS CLASS, SUBCLASS:

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