US PATENT SUBCLASS 507 / 130
.~.~.~ Nitrogen is part of a hetero ring

Current as of: June, 1999
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507 /   HD   EARTH BORING, WELL TREATING, AND OIL FIELD CHEMISTRY

100  DF  EARTH BORING {4}
103  DF  .~ Contains organic component {14}
129  DF  .~.~ Organic component contains nitrogen attached directly or indirectly to carbon by nonionic bonding {2}
130.~.~.~ Nitrogen is part of a hetero ring

DEFINITION

Classification: 507/130

Nitrogen is part of a hetero ring:

(under subclass 129) Composition wherein said component contains nitrogen as part of a hetero ring (e.g., methylene blue, imidazoline, pyridine, piperidine, etc.).

(1) 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. For the purposes of this subclass, the hetero ring requires the presence of nitrogen.