US PATENT SUBCLASS 534 / 16
.~.~ Containing -C(=X)X-, wherein the X's are the same or diverse chalcogens

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534 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (CLASS 532, SUBCLASS 1) {8}
15  DF  .~ RARE EARTH METAL CONTAINING (At. No. 21, 39, 57-60 or 62-71) {1}
16.~.~ Containing -C(=X)X-, wherein the X's are the same or diverse chalcogens

DEFINITION

Classification: 534/16

(under subclass 15) Compounds which contain a -C(=X)X- group, wherein the X's are the same or diverse chalcogens (i.e., oxygen, sulfur, selenium, or tellurium).

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