US PATENT SUBCLASS 987 / 90
.~.~ Single N as only hetero atom in ring (9/553; 9/568)

Current as of: June, 1999
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987 /   HD   ORGANIC COMPOUNDS CONTAINING A Bi, Sb, As, OR P ATOM OR CONTAINING A METAL ATOM OF THE 6TH TO 8TH GROUP OF THE PERIODIC SYSTEM

30  DF  PHOSPHORUS COMPOUNDS (9/02; 9/06) {15}
49  DF  .~ Ring is devoid of a P or a metal atom and contains at least one hereto atom (O, S, N, Se, or Te) and may or may not contain C (9/547; 9/6524) {9}
90.~.~ Single N as only hetero atom in ring (9/553; 9/568) {6}
91  DF  .~.~.~> Seven or more atoms in ring containing the single N atom (9/553A7)
92  DF  .~.~.~> Six atoms in ring containing the single N atom (9/576) {5}
103  DF  .~.~.~> Five-membered ring containing a single N atom (9/572; 9/572G; 9/572K; 9/572K2; 9/572K4; 9/572R) {2}
106  DF  .~.~.~> Four-membered ring containing a single N atom is condensed or bridged to a carbocyclic ring system (9/568V)
107  DF  .~.~.~> N atom of four-membered ring containing a single N atom is bonded directly to a P atom or indirectly to a P atom other than through a ring atom of the four-membered ring (9/568E)
108  DF  .~.~.~> Three-membered ring containing a single N atom (9/564)

DEFINITION

Classification: 987/90

Single N as only hetero atom in ring (9/553; 9/568):

(under subclass 49) Subject matter wherein a ring contains carbon and a single nitrogen atom.

(1) Note. Included herein are those rings that contain three carbon atoms and a single nitrogen atom.