US PATENT SUBCLASS 548 / 964
.~.~.~.~ Having -C(=X)-, wherein X is chalcogen, in chain between the hetero rings

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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}
962  DF  .~.~.~ Additional hetero ring containing {2}
964.~.~.~.~ Having -C(=X)-, wherein X is chalcogen, in chain between the hetero rings

DEFINITION

Classification: 548/964

(under subclass 962) Compounds in which a group, wherein X is chalocogen (i.e., oxygen, sulfur, selenium or tellurium) is

in a chain between the hetero rings.

(1) Note. Examples of compounds provided for herein are: [figure] [figure]