US PATENT SUBCLASS 987 / 74
.~.~.~.~ N atom of ring is bonded directly to a P atom or is bonded indirectly to a P atom other than through a ring atom of the five-membered ring (9/6518E)

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}
71  DF  .~.~.~ Five-membered ring containing three N and two C atoms (9/6518; 9/6518G; 9/6518R) {3}
74.~.~.~.~ N atom of ring is bonded directly to a P atom or is bonded indirectly to a P atom other than through a ring atom of the five-membered ring (9/6518E)

DEFINITION

Classification: 987/74

N atom of ring is bonded directly to a P atom or is bonded indirectly to a P atom other than through a ring atom of the five-membered ring (9/6518E):

(under subclass 71) Subject matter wherein at least one of the nitrogen atoms of the five-membered ring is (a) bonded directly to an extracyclic phosphorus atom or (b) is bonded indirectly through any atom or atoms other than ring atoms of the five-membered ring to a phosphorus atom.