US PATENT SUBCLASS 507 / 243
.~.~.~.~ Plural heteroatoms in the 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}
239  DF  .~.~ Organic component contains nitrogen attached directly or indirectly to carbon by nonionic bonding {6}
242  DF  .~.~.~ Nitrogen is part of a hetero ring {1}
243.~.~.~.~ Plural heteroatoms in the ring

DEFINITION

Classification: 507/243

Plural heteroatoms in the ring:

(under subclass 242) Compositions wherein there are two or more heteroatoms in the hetero ring (e.g., imidazoline, etc.).

(1) Note. The ring heteroatoms are selected from nitrogen, oxygen, sulfur, selenium, and tellurium. For the purposes of this subclass, at least one of the heteroatoms must be nitrogen.