US PATENT SUBCLASS 548 / 956
.~.~.~ Phosphorus attached directly or indirectly to the hetero ring by nonionic bonding

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

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
*  DD  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM, OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS (Class 540, subclass 1) {4}
954  DF  .~.~ Hetero ring is three-membered including nitrogen and carbon {11}
956.~.~.~ Phosphorus attached directly or indirectly to the hetero ring by nonionic bonding {1}
957  DF  .~.~.~.~> Plural phosphori

DEFINITION

Classification: 548/956

(under subclass 954) Compounds in which phosphorus is attached directly or indirectly to the hetero ring by nonionic bonding.

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