US PATENT SUBCLASS 987 / 89
.~.~.~.~ At least one N in 1 and 2 ring positions is bonded directly or indirectly to a P atom (9/6503B2E)

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  DF  .~.~ Exactly two N's as only hetero atom in ring (9/645) {2}
84  DF  .~.~.~ Five-membered ring containing two N's (9/6503; 9/6503B2; 9/6503B2G; 9/6503B2K; 9/6503B2R) {3}
89.~.~.~.~ At least one N in 1 and 2 ring positions is bonded directly or indirectly to a P atom (9/6503B2E)

DEFINITION

Classification: 987/89

At least one N in 1 and 2 ring positions is bonded directly or indirectly to a P atom (9/6503B2E):

(under subclass 84) Subject matter wherein the two nitrogen atoms in the five-membered ring are in 1 and 2 positions and wherein an extracyclic phosphorus atom is directly or indirectly bonded to a nitrogen atom of the ring.

(1) Note. Indirectly as used in this subclass is meant to exclude compounds wherein a phosphorus atom is first bonded to a ring carbon, either directly or indirectly, and which ring carbon is eventually bonded to a nitrogen atom of the same ring.