US PATENT SUBCLASS 558 / 218
.~.~ Three divalent chalcogens single bonded directly to trivalent phosphorus (e.g., trialkyl phosphites, etc.)

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}
218.~.~ Three divalent chalcogens single bonded directly to trivalent phosphorus (e.g., trialkyl phosphites, etc.)

DEFINITION

Classification: 558/218

(under subclass 70) Compounds in which three divalent chalcogens (i.e., oxygen, sulfor, selenium, or tellurium), which may be the same or diverse, are single bonded directly to trivalent phosphorus.

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