US PATENT SUBCLASS 556 / 31
.~.~.~ Containing -C(=X)-, wherein X is chalcogen (e.g., carbonyl containing, etc.)

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

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {3}
1  DF  .~ HEAVY METAL CONTAINING (e.g., Ga, In or T1, etc.) {19}
28  DF  .~.~ Plural diverse heavy metals containing {3}
31.~.~.~ Containing -C(=X)-, wherein X is chalcogen (e.g., carbonyl containing, etc.)

DEFINITION

Classification: 556/31

(under subclass 28) Compounds which contain a -C(=X)- group, wherein X is chalcogen (i.e., oxygen, sulfur, selenium or tellurium).