US PATENT SUBCLASS 507 / 229
.~.~.~.~ Hetero nitrogen ring is attached directly or indirectly to the ethylenic monomer by nonionic bonding

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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}
229.~.~.~.~ Hetero nitrogen ring is attached directly or indirectly to the ethylenic monomer by nonionic bonding

DEFINITION

Classification: 507/229

Hetero nitrogen ring is attached directly or indirectly to the ethylenic monomer by nonionic bonding:

(under subclass 221) Compositions wherein the polymer contains a nitrogen containing hetero ring which is attached to an ethylenic moiety directly or indirectly by nonionic bonding.

(1) Note. A hetero ring as part of a mere counterion to an ethylenic moiety is not a basis for including such a composition in this subclass. For example, a pyridinium poly(vinyl sulfate) is classified in subclass 227. An additional cross-reference in subclass 240 in accordance with the (8) Note under subclass 200 is highly recommended.

(2) Note. The term "hetero ring" denotes a ring having carbon and at least one atom from the group consisting of nitrogen, oxygen, sulfur, selenium, and tellurium as ring members; and contains no other element as a ring member. As

the term relates to this subclass, nitrogen must be one of the hetero atoms in the ring.

SEE OR SEARCH THIS CLASS, SUBCLASS:

242, for organic N-heterocyclic cations to polymeric anions.