US PATENT SUBCLASS 564 / 497
.~.~.~ Purification or recovery

Current as of: June, 1999
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564 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
1  DF  .~ AMINO NITROGEN CONTAINING (E.G., UREA, SULFONAMIDES, NITROSAMINES, OXYAMINES, ETC., AND SALTS THEREOF) {37}
463  DF  .~.~ Acyclic {16}
497.~.~.~ Purification or recovery {2}
498  DF  .~.~.~.~> Of an alkylene polyamine
499  DF  .~.~.~.~> Separating primary, secondary, or tertiary amines from each other

DEFINITION

Classification: 564/497

(under subclass 463) Processes directed to the purification, separation, or recovery of acyclic amino nitrogen containing compounds.