US PATENT SUBCLASS 987 / 84
.~.~.~ Five-membered ring containing two N's (9/6503; 9/6503B2; 9/6503B2G; 9/6503B2K; 9/6503B2R)

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}
75  DF  .~.~ Exactly two N's as only hetero atom in ring (9/645) {2}
84.~.~.~ Five-membered ring containing two N's (9/6503; 9/6503B2; 9/6503B2G; 9/6503B2K; 9/6503B2R) {3}
85  DF  .~.~.~.~> N in 1 and 3 ring positions (9/6506; 9/6506G; 9/6506K; 9/6506R) {2}
88  DF  .~.~.~.~> N in 1 and 2 ring positions and wherein the ring is condensed or bridged to a carbocyclic ring system (9/6503B2V)
89  DF  .~.~.~.~> At least one N in 1 and 2 ring positions is bonded directly or indirectly to a P atom (9/6503B2E)

DEFINITION

Classification: 987/84

Five-membered ring containing two N's (9/6503; 9/6503B2; 9/6503B2G; 9/6503B2K; 9/6503B2R):

(under subclass 75) Subject matter wherein the ring is five membered and contains three carbons and two nitrogen atoms.

(1) Note. Included herein are rings wherein the nitrogens are in 1 and 2 ring positions.