US PATENT SUBCLASS 549 / 8
.~.~.~.~.~ Four chalcogens bonded directly to the same phosphorus

Current as of: June, 1999
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549 /   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) {2}
1  DF  .~.~ Sulfur containing hetero ring (e.g., thiiranes, etc.) {9}
5  DF  .~.~.~ Phosphorus attached directly or indirectly to the hetero ring by nonionic bonding {1}
6  DF  .~.~.~.~ The hetero ring is five-membered {2}
8.~.~.~.~.~ Four chalcogens bonded directly to the same phosphorus

DEFINITION

Classification: 549/8

(under subclass 6) Compounds having exactly four chalcogens (i.e., oxygen, sulfur, selenium, or tellurium) bonded directly to the same phosphorus atom.