US PATENT SUBCLASS 562 / 48
.~.~.~.~.~ Benzene ring bonded directly to each nitrogen of a -NH-C(=X)-NH-group, wherein X is chalcogen and substitution may be made for hydrogen only

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

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {41}
30  DF  .~ Sulfonic acids or salts thereof (i.e., compounds containing the sulfonate group, -S(=O)(=O)-O- wherein the single bonded oxygen is bonded directly to hydrogen, or to a group IA or IIA light metal or to substituted or unsubstituted ammonium) {15}
45  DF  .~.~ Benzene ring bonded directly to the sulfonate sulfur (e.g., purification and neutralization of benzene sulfonic acids, etc.) {11}
46  DF  .~.~.~ Having -C(=X)-, wherein X is chalcogen, attached indirectly to the sulfonate group by nonionic bonding (e.g., aldehydes, etc.) {1}
47  DF  .~.~.~.~ Chalcogen or nitrogen bonded directly to the -C(=X)- group {5}
48.~.~.~.~.~ Benzene ring bonded directly to each nitrogen of a -NH-C(=X)-NH-group, wherein X is chalcogen and substitution may be made for hydrogen only {2}
49  DF  .~.~.~.~.~.~> At least one of the benzene rings is part of a naphthalene ring system
50  DF  .~.~.~.~.~.~> Plural naphthalene ring systems attached indirectly to the -NHC(=X)NH- group by nonionic bonding

DEFINITION

Classification: 562/48

(under subclass 47) Compounds wherein each nitrogen of a -NH-C(=X)-NH- group, wherein X is chalcogen and substitution may be made for hydrogen only, is bonded directly to a benzene ring.

(1) Note. An example of a compound provided for herein is: [figure]