US PATENT SUBCLASS 540 / 487
.~.~.~.~ Silicon or phosphorus attached directly or indirectly to the hetero ring by nonionic bonding

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

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
1  DF  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS {6}
484  DF  .~.~ The hetero ring contains seven members including nitrogen and carbon {14}
485  DF  .~.~.~ Chalcogen double bonded directly to a ring carbon adjacent to the ring nitrogen (e.g., caprolactam, etc.) {15}
487.~.~.~.~ Silicon or phosphorus attached directly or indirectly to the hetero ring by nonionic bonding

DEFINITION

Classification: 540/487

(under subclass 485) Compounds in which phosphorus or silicon is attached directly or indirectly to the hetero ring by nonionic bonding.

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