US PATENT SUBCLASS 556 / 408
.~.~.~ Chalcogen is member of the ring

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}
400  DF  .~ SILICON CONTAINING {19}
407  DF  .~.~ Nitrogen is ring member {2}
408.~.~.~ Chalcogen is member of the ring

DEFINITION

Classification: 556/408

(under subclass 407) Compounds in which the ring additionally contains chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) as a ring member.

(1) Note. Examples of compounds provided for herein are: [figure] [figure]