US PATENT SUBCLASS 514 / 210
.~.~ Hetero ring is four-membered and includes at least one nitrogen

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514 /   HD   DRUG, BIO-AFFECTING AND BODY TREATING COMPOSITIONS

1  DF  DESIGNATED ORGANIC ACTIVE INGREDIENT CONTAINING (DOAI) {29}
183  DF  .~ Heterocyclic carbon compounds containing a hetero ring having chalcogen (i.e., O,S,Se or Te) or nitrogen as the only ring hetero atoms DOAI {16}
210.~.~ Hetero ring is four-membered and includes at least one nitrogen

DEFINITION

Classification: 514/210

Hetero ring is four-membered and includes at least one nitrogen:

(under subclass 183) Subject matter which contains a heterocyclic ring consisting of four atoms, at least one of which is nitrogen.

(1) Note. The heterocyclic ring may include other hetero atoms of the group set forth in the definition of subclass 183 and the relative positions of the hetero atoms may vary.

SEE OR SEARCH CLASS

540, Organic Compounds,

121+, Class 548, subclasses 950+ for a compound which includes a four-membered hetero ring containing nitrogen.