US PATENT SUBCLASS 534 / 767
.~.~.~.~.~.~ The hetero ring contains at least two nitrogens (e.g., pyrimidine, etc.)

Current as of: June, 1999
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534 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (CLASS 532, SUBCLASS 1) {8}
573  DF  .~ Azo {51}
751  DF  .~.~ Hetero ring containing {5}
753  DF  .~.~.~ Azo bonded directly to the hetero ring or to a polycyclo ring system which contains the hetero ring as one of the cyclos {11}
765  DF  .~.~.~.~ Additional hetero ring or polycyclo ring system which contains a hetero ring as one of the cyclos bonded directly to the azo group {2}
766  DF  .~.~.~.~.~ The hetero ring is six-membered and contains nitrogen (e.g., pyridine, etc.) {2}
767.~.~.~.~.~.~ The hetero ring contains at least two nitrogens (e.g., pyrimidine, etc.)

DEFINITION

Classification: 534/767

(under subclass 766) Compounds wherein the hetero ring contains at least two nitrogens, e.g., pyrimidine, triazine, etc.

(1) Note. An example of a compound provided for herein is: [figure]