US PATENT SUBCLASS 504 / 136
.~.~.~.~ The hetero ring consists of two nitrogens and four carbons

Current as of: June, 1999
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504 /   HD   PLANT PROTECTING AND REGULATING COMPOSITIONS

116  DF  PLANT GROWTH REGULATING COMPOSITIONS (E.G., HERBICIDES, ETC.) {9}
118  DF  .~ Plural active ingredients {7}
129  DF  .~.~ Hetero ring containing active ingredient {3}
130  DF  .~.~.~ Hetero ring is six-membered including nitrogen {3}
136.~.~.~.~ The hetero ring consists of two nitrogens and four carbons {1}
137  DF  .~.~.~.~.~> 1,2-diazines (e.g., pyridazones, etc.)

DEFINITION

Classification: 504/136

The hetero ring consists of two nitrogens and four carbons:

(under subclass 130) Compositions wherein the six-membered hetero ring consists of two ring nitrogens and four ring carbons.