US PATENT SUBCLASS 507 / 223
.~.~.~.~.~ Nitrogen of the quaternary ammonium group is a member of a hetero ring

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}
219  DF  .~.~ Organic component is solid synthetic resin {2}
221  DF  .~.~.~ Resin is polymer derived from ethylenic monomers only (e.g., maleic, itaconic, etc.) {6}
222  DF  .~.~.~.~ Polymer derived from monomer having quaternary ammonium group {1}
223.~.~.~.~.~ Nitrogen of the quaternary ammonium group is a member of a hetero ring

DEFINITION

Classification: 507/223

Nitrogen of the quaternary ammonium group is a member of a hetero ring:

(under subclass 222) Compositions wherein the nitrogen is a member of a hetero ring.