US PATENT SUBCLASS 556 / 420
.~.~.~.~.~ The -C(=X)- is part of a -C(=X)X- group, wherein the X's are the same or diverse chalcogens

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

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {3}
400  DF  .~ SILICON CONTAINING {19}
413  DF  .~.~ Nitrogen attached indirectly to silicon by nonionic bonding {7}
418  DF  .~.~.~ Having -C(=X)-, wherein X is chalcogen, attached indirectly to silicon by nonionic bonding {1}
419  DF  .~.~.~.~ Nitrogen is bonded directly to the -C(=X)- group {2}
420.~.~.~.~.~ The -C(=X)- is part of a -C(=X)X- group, wherein the X's are the same or diverse chalcogens

DEFINITION

Classification: 556/420

(under subclass 419) Compounds in which the is part of aX- 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]