US PATENT SUBCLASS 507 / 221
.~.~.~ Resin is polymer derived from ethylenic monomers only (e.g., maleic, itaconic, etc.)

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.~.~.~ 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}
224  DF  .~.~.~.~> Polymer derived from acrylic acid monomer or derivative {1}
227  DF  .~.~.~.~> Sulfur is attached directly or indirectly to the ethylenic monomer by nonionic bonding {1}
229  DF  .~.~.~.~> Hetero nitrogen ring is attached directly or indirectly to the ethylenic monomer by nonionic bonding
230  DF  .~.~.~.~> Polymer contains vinyl alcohol unit
231  DF  .~.~.~.~> Carbocyclic ring is attached directly or indirectly to the ethylenic monomer by nonionic bonding (e.g., styrene, vinyl toluene, etc.)

DEFINITION

Classification: 507/221

Resin is polymer derived from ethylenic monomers only (e.g., maleic, itaconic, etc.):

(under subclass 219) Compositions wherein the resin is a polymer derived from ethylenically unsaturated monomers only.

(1) Note. The ethylenically unsaturated monomer requires the presence of two aliphatic carbon atoms bonded together by a double or triple bond. See Class 526, subclass 72, for a detailed discussion of polymers from only ethylenic monomers.

(2) Note. Cross-linking an ethylenic polymer with a nonethylenic cross-linking agent will not take the polymer out of this subclass.