US PATENT SUBCLASS 540 / 202
.~.~.~ Plural hetero atoms in the hetero ring

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

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
1  DF  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS {6}
200  DF  .~.~ Hetero ring is four-membered containing nitrogen and having chalcogen double bonded directly to a ring carbon which is adjacent to the ring nitrogen {7}
202.~.~.~ Plural hetero atoms in the hetero ring

DEFINITION

Classification: 540/202

(under subclass 200) Compounds wherein the hetero ring contains at least two hetero atoms.

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