US PATENT SUBCLASS 987 / 70
.~.~.~.~ 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)

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  DF  .~.~.~ Six-membered ring containing three N and three C atoms (9/6521; 9/6521E; 9/6521G; 9/6521R) {2}
70.~.~.~.~ 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: 987/70

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):

(under subclass 68) Subject matter wherein at least one of the carbon atoms of the six-membered ring is (a) bonded directly to an extracyclic phosphorus atom or (b) is bonded directly to an extracyclic hetero atom other than nitrogen, and which hetero atom is directly bonded to an extracyclic phosphorus atom.