US PATENT SUBCLASS 987 / 75
.~.~ Exactly two N's as only hetero atom in ring (9/645)

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.~.~ Exactly two N's as only hetero atom in ring (9/645) {2}
76  DF  .~.~.~> Six-membered ring containing two N and four C atoms (9/6509; 9/6509B2; 9/6509B2E; 9/6509B2G; 9/6509B2K; 9/6509B2R) {3}
84  DF  .~.~.~> Five-membered ring containing two N's (9/6503; 9/6503B2; 9/6503B2G; 9/6503B2K; 9/6503B2R) {3}

DEFINITION

Classification: 987/75

Exactly two N's as only hetero atom in ring (9/645):

(under subclass 49) Subject matter wherein a ring contains only carbon and exactly two nitrogen atoms.