US PATENT SUBCLASS 564 / 66
.~.~.~.~ Preparing directly from ammonium carbamate (i.e., from HNH-COO-HHNHH)

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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}
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}
66.~.~.~.~ Preparing directly from ammonium carbamate (i.e., from HNH-COO-HHNHH)

DEFINITION

Classification: 564/66

(under subclass 63) Processes in which urea is prepared directly from ammonium carbamate.

SEE OR SEARCH THIS CLASS, SUBCLASS:

70, for the preparation of urea from ammonia and carbon dioxide which includes the decomposition of by-product ammonium carbamate.