US PATENT SUBCLASS 987 / 67
.~.~ Exactly three N atoms as only hetero atoms in ring (9/6515)

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.~.~ Exactly three N atoms as only hetero atoms in ring (9/6515) {2}
68  DF  .~.~.~> Six-membered ring containing three N and three C atoms (9/6521; 9/6521E; 9/6521G; 9/6521R) {2}
71  DF  .~.~.~> Five-membered ring containing three N and two C atoms (9/6518; 9/6518G; 9/6518R) {3}

DEFINITION

Classification: 987/67

Exactly three N atoms as only hetero atoms in ring (9/6515):

(under subclass 49) Subject matter wherein a ring contains three nitrogen atoms as the only ring hetero atoms.