US PATENT SUBCLASS 507 / 222
.~.~.~.~ Polymer derived from monomer having quaternary ammonium group

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.~.~.~.~ Polymer derived from monomer having quaternary ammonium group {1}
223  DF  .~.~.~.~.~> Nitrogen of the quaternary ammonium group is a member of a hetero ring

DEFINITION

Classification: 507/222

Polymer derived from monomer having quaternary ammonium group:

(under subclass 221) Compositions wherein the polymer has been derived from an ethylenic monomer containing a quaternary ammonium group and where the ammonium nitrogen is attached to the ethylenic monomer by direct or indirect nonionic bonding.

(1) Note. A quaternary ammonium moiety which contains no nonionic bond to the polymer is classified primarily according to functional groups which are covalently bound to the polymer. A cross-reference to subclass 240 is strongly recommended.