US PATENT SUBCLASS 548 / 966
.~.~.~ Having -C(=X)-, wherein X is chalcogen, bonded directly to the hetero ring

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

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
*  DD  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM, OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS (Class 540, subclass 1) {4}
954  DF  .~.~ Hetero ring is three-membered including nitrogen and carbon {11}
966.~.~.~ Having -C(=X)-, wherein X is chalcogen, bonded directly to the hetero ring

DEFINITION

Classification: 548/966

(under subclass 954) Compounds in which, wherein X is chalcogen (i.e., oxygen, sulfur, selenium or tellurium) is bonded directly to the hetero ring.

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