US PATENT SUBCLASS 204 / 157.72
.~.~.~.~.~ Hetero nitrogen ring contains at least two hetero atoms

Current as of: June, 1999
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204 /   HD   CHEMISTRY: ELECTRICAL AND WAVE ENERGY

*  DD  PROCESSES AND PRODUCTS {7}
157.15  DF  .~ Processes of treating materials by wave energy {6}
157.6  DF  .~.~ Process or preparing desired organic product containing at least one atom other than carbon and hydrogen {16}
157.69  DF  .~.~.~ Heterocyclic product produced {2}
157.71  DF  .~.~.~.~ Hetero nitrogen containing {1}
157.72.~.~.~.~.~ Hetero nitrogen ring contains at least two hetero atoms

DEFINITION

Classification: 204/157.72

Hetero nitrogen ring contains at least two hetero atoms:

(under subclass 157.71) Subject matter wherein there is at least one nitrogen atom and at least one other atom selected from oxygen, nitrogen, selenium or tellurium in the same hetero ring.