US PATENT SUBCLASS 987 / 33
.~ Compound contains a ring which is devoid of a metal atom and contains at least one P atom as ring member (9/6564; 9/6564V; 9/6568; 9/6568B; 9/6568C; 9/6568D; 9/6568E; 9/6568F)

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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}
33.~ Compound contains a ring which is devoid of a metal atom and contains at least one P atom as ring member (9/6564; 9/6564V; 9/6568; 9/6568B; 9/6568C; 9/6568D; 9/6568E; 9/6568F) {3}
34  DF  .~.~> Ring contains N and P only, or may include in addition to the required N and P, only C, S, or O (9/6581; 9/6584; 9/6584A) {1}
36  DF  .~.~> Ring contains S and P only, or may include in addition to the required S and P, only C or O (9/6578; 9/6578D)
37  DF  .~.~> Ring contains O and P only, or may include in addition to the required O and P, only C (9/6571) {5}

DEFINITION

Classification: 987/33

Compound contains a ring which is devoid of a metal atom and contains at least one P atom as ring member (9/6564; 9/6564V; 9/6568; 9/6568B; 9/6568C; 9/6568D; 9/6568E; 9/6568F):

(under subclass 30) Subject matter wherein a phosphorus atom is part of a ring.

(1) Note. When phosphorus is a ring member, the traditional definition of "heterocyclic" atom, as used throughout the Class 532 series, is not met. Furthermore, the definition of "heterocyclic," in the 532 series, requires the presence of a carbon atom as a ring member, this is not the situation in the EPC.

(2) Note. Whenever a ring atom is used throughout this and its indented subclasses, it is meant to include only those additional atoms that are in the same ring as is phosphorus. An example of this is subclass 46, the oxygen ring atom must be in the same ring with the P atom.

(3) Note. Extracyclic, as used in this and its indented subclasses, is meant to include atoms not in the same ring as phosphorus. A non-ring atom would include a heterocyclic ring containing that atom in a ring devoid of phosphorus and other ring atoms required by the title of the subclass.