US PATENT SUBCLASS 558 / 161
.~.~.~.~ Divalent chalcogen double bonded directly to pentavalent phosphorus

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}
155  DF  .~.~ Plural phosphori attached directly or indirectly to each other by nonionic bonding {1}
156  DF  .~.~.~ Plural phosphorus ester groups {4}
161.~.~.~.~ Divalent chalcogen double bonded directly to pentavalent phosphorus {2}
162  DF  .~.~.~.~.~> Plural phosphori attached indirectly to each other by a benzene ring or by a chain which includes a benzene ring
163  DF  .~.~.~.~.~> Plural phosphori attached indirectly to each other by an acyclic chalcogen containing chain {1}

DEFINITION

Classification: 558/161

(under subclass 156) Compounds wherein a divalent chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) is double bonded directly to a pentavalent phosphorus.

(1) Note. An example of a compound provided for herein is: [figure]