US PATENT SUBCLASS 507 / 248
.~.~.~ Organic component consists only of carbon, hydrogen, and nitrogen

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}
248.~.~.~ Organic component consists only of carbon, hydrogen, and nitrogen {2}
249  DF  .~.~.~.~> Organic component contains carbon double or triple bonded to nitrogen (e.g., cyano, nitrilo, etc.)
250  DF  .~.~.~.~> Organic component is acyclic {1}

DEFINITION

Classification: 507/248

Organic component consists only of carbon, hydrogen, and

nitrogen:

(under subclass 239) Compositions wherein the organic component includes only carbon, hydrogen, and nitrogen.