US PATENT SUBCLASS 558 / 81
.~.~.~.~ And chalcogen or carbon 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}
80  DF  .~.~.~ And nitrogen in the ring {1}
81.~.~.~.~ And chalcogen or carbon in the ring

DEFINITION

Classification: 558/81

(under subclass 80) Compounds wherein the phosphorus containing ring also contains carbon or chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) as a ring member.

(1) Note. Examples of compounds provided for herein are: [figure] [figure]