US PATENT SUBCLASS 558 / 153
.~.~ Phosphorus and a -C(=X)- group, wherein X is chalcogen, bonded directly to the same chalcogen

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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}
153.~.~ Phosphorus and a -C(=X)- group, wherein X is chalcogen, bonded directly to the same chalcogen

DEFINITION

Classification: 558/153

(under subclass 70) Compounds unde ... which include the P-X-C(=X)- group wherein the X's are the same or diverse chalcogens (i.e., oxygen, sulfur, selenium, or telluriurium), and the phosphorus is trivalent or pentavalent.