US PATENT SUBCLASS 987 / 54
.~.~ At least two different rings containing hetero atoms or wherein, if the rings are the same, the substituents on at least two of the rings are different (9/6558; 9/6558B)

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}
54.~.~ At least two different rings containing hetero atoms or wherein, if the rings are the same, the substituents on at least two of the rings are different (9/6558; 9/6558B) {1}
55  DF  .~.~.~> At least one of the rings is devoid of N as ring atom (9/6558C)

DEFINITION

Classification: 987/54

At least two different rings containing hetero atoms or wherein, if the rings are the same, the substituents on at least two of the rings are different (9/6558; 9/6558B):

(under subclass 49) Subject matter wherein the P compound (a) contains at least two different ring systems, each of which contains at least one atom other than carbon, or (b) where a compound contains a plurality of identical rings, each of which contains at least one atom other than carbon and wherein the substituents on at least two of the identical ring systems are different.