US PATENT SUBCLASS 987 / 76
.~.~.~ Six-membered ring containing two N and four C atoms (9/6509; 9/6509B2; 9/6509B2E; 9/6509B2G; 9/6509B2K; 9/6509B2R)

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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}
76.~.~.~ Six-membered ring containing two N and four C atoms (9/6509; 9/6509B2; 9/6509B2E; 9/6509B2G; 9/6509B2K; 9/6509B2R) {3}
77  DF  .~.~.~.~> N in 1 and 3 ring positions (9/6512; 9/6512E; 9/6512G; 9/6512R) {3}
81  DF  .~.~.~.~> N in 1 and 4 ring positions (9/6509B4; 9/6509B4G; 9/6509B4K; 9/6509B4R; 9/6509B4V) {1}
83  DF  .~.~.~.~> N in 1 and 2 ring positions and wherein the ring is condensed or bridged to a carbocyclic ring system (9/6509B2V)

DEFINITION

Classification: 987/76

Six-membered ring containing two N and four C atoms (9/6509; 9/6509B2; 9/6509B2E; 9/6509B2G; 9/6509B2K; 9/6509B2R):

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

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