US PATENT SUBCLASS 987 / 49
.~ 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)

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.~ 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}
50  DF  .~.~> At least two rings, each ring containing at least one hetero atom, and wherein the rings are condensed directly to each other or condensed together through a common carbocyclic ring system (9/6561) {3}
54  DF  .~.~> 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}
56  DF  .~.~> Ring contains S only, or may include in addition to the required S, only C, Se, or Te (9/6553) {1}
58  DF  .~.~> Ring contains O only, or may include in addition to the required O, only C, S, Se, or Te (9/655) {2}
61  DF  .~.~> Ring contains N and S only, or may include in addition to the required N and S, only C, O, Se, or Te (9/6536) {2}
65  DF  .~.~> Ring contains N and O only, or may include in addition to the required N and O, only C (9/6527; 9/653; 9/653V) {1}
67  DF  .~.~> Exactly three N atoms as only hetero atoms in ring (9/6515) {2}
75  DF  .~.~> Exactly two N's as only hetero atom in ring (9/645) {2}
90  DF  .~.~> Single N as only hetero atom in ring (9/553; 9/568) {6}

DEFINITION

Classification: 987/49

Ring is devoid of a P or a metal atom and contains at least one hetero atom (O, S, N, Se, or Te) and may or may not contain C (9/547; 9/6524):

(under subclass 30) Subject matter wherein the phosphorus compound contains at least one hetero atom (i.e., oxygen, sulfur, nitrogen, selenium or tellurium) as a ring member, and wherein the ring may or may not contain carbon.

(1) Note. Compounds herein are not required to have carbon atoms as ring atoms. Compounds which are devoid of a carbon atom as a ring member are not in fact "heterocyclic compounds" as used throughout the Class 532 series. In those instances where the ring does contain at least one atom of carbon the term is identical in usage to the Class 532 series. When the term "heterocyclic ring" is used in this class, it does in fact conform to the Class 532 definition.

(2) Note. Included specifically in this subclass are rings containing four or more nitrogen atoms.

(3) Note. The rule to be followed in those compounds containing multiple rings having an atom other than carbon as ring members is that classification is made on the ring nearest to the phosphorus atom. It is desirable, however, if classifications are assigned for each of the rings.