US PATENT SUBCLASS 558 / 172
.~.~.~.~.~ The -C(=X)- is part of a -C(=X)X- group, wherein the X's may be the same or diverse chalcogens


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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}
169  DF  .~.~.~ Chalcogen attached indirectly to the phosphorus by acyclic nonionic bonding {2}
170  DF  .~.~.~.~ The chalcogen, X, is in a -C(=X)- group, which group is bonded directly to the nitrogen {4}
172.~.~.~.~.~ The -C(=X)- is part of a -C(=X)X- group, wherein the X's may be the same or diverse chalcogens


DEFINITION

Classification: 558/172

(under subclass 170) Compounds in which the -C(=X)- is part of a -C(=X)X- group, wherein the X's may be the same or diverse chalcogens.

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