US PATENT SUBCLASS 564 / 32
.~.~ Ureas (i.e., HNH-CO-HNH, wherein substitution may be made for hydrogen only)

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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.~.~ Ureas (i.e., HNH-CO-HNH, wherein substitution may be made for hydrogen only) {9}
33  DF  .~.~.~> Nitro or nitroso bonded directly to nitrogen
34  DF  .~.~.~> Carbazides or semicarbazides (i.e., HNH-NH-CO-HNH, wherein substitution may be made for hydrogen only) {3}
38  DF  .~.~.~> Biurets (i.e., HNH-CO-NH-CO-HNH, wherein substitution may be made for hydrogen only)
39  DF  .~.~.~> Sulfur attached directly to urea nitrogen by nonionic bonding {2}
44  DF  .~.~.~> Additional carbonyl bonded directly to urea nitrogen {1}
47  DF  .~.~.~> Benzene ring containing {2}
57  DF  .~.~.~> Alicyclic ring containing
58  DF  .~.~.~> Additional carbon bonded directly to urea nitrogen {3}
63  DF  .~.~.~> Urea per se or salt thereof {5}

DEFINITION

Classification: 564/32

(under subclass 1) Compounds which have the grouping - -

(1) Note. This subclass contains, for example, adducts of urea with inorganic compounds such as hydrogen peroxide or calcium nitrate.

SEE OR SEARCH THIS CLASS, SUBCLASS:

260, Chemistry of Carbon Compounds, subclass 96.5 for adducts of urea with organic compounds.

558, Organic Compounds, subclass 8 for isoureas or pseudoureas.

564, Organic Compounds, subclass 1.5 for adducts of urea with organic compounds.