US PATENT SUBCLASS 540 / 200
.~.~ Hetero ring is four-membered containing nitrogen and having chalcogen double bonded directly to a ring carbon which is adjacent to the ring nitrogen

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.~.~ 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}
201  DF  .~.~.~> Heavy metal containing
202  DF  .~.~.~> Plural hetero atoms in the hetero ring
203  DF  .~.~.~> Polycyclo ring system containing the hetero ring as one of the cyclos {4}
354  DF  .~.~.~> Additional chalcogen bonded directly to the hetero ring {5}
361  DF  .~.~.~> Halogen attached directly at the 4-position of the hetero ring by nonionic bonding
362  DF  .~.~.~> The 4-position of the hetero ring is unsubstituted or alkyl substituted only {1}
364  DF  .~.~.~> Nitrogen bonded directly at the 3-position of the hetero ring

DEFINITION

Classification: 540/200

(under subclass 1) Compounds in which the hetero ring is four-membered, contains nitrogen and has chalcogen (i.e., oxygen, sulfur, selenium or tellurium) double bonded directly to a ring carbon which is adjacent to the ring nitrogen.

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