US PATENT SUBCLASS 558 / 331
.~.~ Homopolymerization of HCN (e.g., tetramerization of HCN to diaminomaleonitrile)

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558 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {21}
303  DF  .~ Nitriles (i.e., compounds having cyano bonded directly to carbon, which carbon may be single bonded to any atom but may be multiple bonded only to carbon) {21}
331.~.~ Homopolymerization of HCN (e.g., tetramerization of HCN to diaminomaleonitrile)

DEFINITION

Classification: 558/331

Processes under subclss 303 wherein the reaction that occurs is the condensation of plural molecules of HCN to produce diaminomaleonitrile.