US PATENT SUBCLASS 556 / 61
.~.~.~ Containing -C(=X)X-, wherein the X's are the same or diverse chalcogens

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}
57  DF  .~.~ Chromium, molybdenum, or tungsten containing (Cr, Mo, or {2}
61.~.~.~ Containing -C(=X)X-, wherein the X's are the same or diverse chalcogens {2}
62  DF  .~.~.~.~> The carbons of plural -C(X=)X- groups, are bonded directly to each other, to the same acyclic carbon, (e.g., chromium oxalates, etc.)
63  DF  .~.~.~.~> Nitrogen or halogen containing

DEFINITION

Classification: 556/61

(under subclass 57) 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).