US PATENT SUBCLASS 558 / 76
.~.~.~ Additional phosphorus containing ring


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

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {21}
70  DF  .~ Phosphorus esters (i.e., compounds having the phosphorus ester group, wherein trivalent or pentavalent phosphorus and carbon are bonded directly to the same divalent chalcogen, and wherein the carbon may be single bonded to any atom but may be multiple bonded only to carbon) {18}
73  DF  .~.~ The phosphorus is in a ring {4}
76.~.~.~ Additional phosphorus containing ring {1}
77  DF  .~.~.~.~> Phosphorus, and two chalcogens bonded directly thereto, in the same ring (e.g., cyclic phosphonates, etc.) {1}


DEFINITION

Classification: 558/76

(under subclass 73) Compounds which contain more than one phosphorus containing ring.