US PATENT SUBCLASS 558 / 82
.~.~.~ And carbon and chalcogen in the 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}
82.~.~.~ And carbon and chalcogen in the ring {1}
83  DF  .~.~.~.~> Plural chalcogens in the ring {2}

DEFINITION

Classification: 558/82

(under subclass 73) Compounds wherein the phosphorus containing ring also contains carbon and chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) as ring members.

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