US PATENT SUBCLASS 534 / 823
.~.~.~.~ Containing -C(=X)-, wherein X is chalcogen (e.g., carbonyl, etc.)

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

*  DD  ORGANIC COMPOUNDS (CLASS 532, SUBCLASS 1) {8}
573  DF  .~ Azo {51}
816  DF  .~.~ Exactly two azo groups attached indirectly to each other by nonionic bonding {7}
822  DF  .~.~.~ Plural benzene rings bonded directly to each other and are between the azo groups {2}
823.~.~.~.~ Containing -C(=X)-, wherein X is chalcogen (e.g., carbonyl, etc.)

DEFINITION

Classification: 534/823

(under subclass 822) Compounds which contain a -- group, wherein X is chalcogen (i.e, oxygen, sulfur, selenium or tellurium).

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