US PATENT SUBCLASS 558 / 168
.~.~.~.~ Chalcogen attached indirectly to the phosphorus by acyclic nonionic bonding

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}
166  DF  .~.~ Nitrogen attached indirectly to the phosphorus by acyclic nonionic bonding {3}
167  DF  .~.~.~ The nitrogen is part of a cyano or isocyano group {1}
168.~.~.~.~ Chalcogen attached indirectly to the phosphorus by acyclic nonionic bonding

DEFINITION

Classification: 558/168

(under subclass 167) Compounds wherein chalcogen (i.e., oxygen, sulfur, selenium, or tellurium) is attached indirectly to the phosphorus by acyclic nonionic bonding.

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