US PATENT SUBCLASS 436 / 98
.~.~ Plural nitrogen in the same ring (e.g., barbituates, creatinine, etc.)

Current as of: June, 1999
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436 /   HD   CHEMISTRY: ANALYTICAL AND IMMUNOLOGICAL TESTING

91  DF  HETEROCYCLIC CARBON COMPOUND (I.E., O, S, N, Se, Te, AS ONLY RING HETERO ATOM) {3}
96  DF  .~ Hetero-N {2}
98.~.~ Plural nitrogen in the same ring (e.g., barbituates, creatinine, etc.) {1}
99  DF  .~.~.~> Uric acid

DEFINITION

Classification: 436/98

Plural nitrogen in the same ring (e.g., barbituarates, creatinine, etc.):

(under subclass 96) Subject matter in which the compound to be analyzed contains a hetero ring with two or more nitrogen atoms as members of the same ring.

(1) Note. This subclass provides for (a) barbituric acid derivatives including dephenylhydantoin, phenobarbital, secobarbital, pentobarbital, amobarbital, aprobarbital and thiopental and (b) paraquat.