US PATENT SUBCLASS 987 / 68
.~.~.~ Six-membered ring containing three N and three C atoms (9/6521; 9/6521E; 9/6521G; 9/6521R)


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}
67  DF  .~.~ Exactly three N atoms as only hetero atoms in ring (9/6515) {2}
68.~.~.~ Six-membered ring containing three N and three C atoms (9/6521; 9/6521E; 9/6521G; 9/6521R) {2}
69  DF  .~.~.~.~> Six-membered ring is condensed or bridged to a carbocyclic ring system (9/6521V)
70  DF  .~.~.~.~> C atom of ring is bonded directly to a P atom, or is bonded directly to a hetero atom other than N and the hetero atom is directly bonded to a P atom (9/6521K)


DEFINITION

Classification: 987/68

Six-membered ring containing three N and three C atoms (9/6521; 9/6521E; 9/6521G; 9/6521R):

(under subclass 67) Subject matter wherein the ring is six membered and contains three carbons and three nitrogen atoms.