| 564 / | HD | ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES |
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| * | DD | ORGANIC COMPOUNDS (Class 532, Subclass 1) {1} |
| 1 | DF | .~ AMINO NITROGEN CONTAINING (E.G., UREA, SULFONAMIDES, NITROSAMINES, OXYAMINES, ETC., AND SALTS THEREOF) {37} |
| 32 | DF | .~.~ Ureas (i.e., HNH-CO-HNH, wherein substitution may be made for hydrogen only) {9} |
| 63 | DF | .~.~.~ Urea per se or salt thereof {5} |
| 67 | DF | .~.~.~.~ Preparing directly from ammonia and carbon dioxide {3} |
| 70 | DF | .~.~.~.~.~ With decomposition of by-product ammonium carbamate (i.e., decomposition of HNH-COO-HHNHH) {2} |
| 71 |  | .~.~.~.~.~.~ Utilizing indirect heat exchange |