US PATENT SUBCLASS 987 / 35
.~.~.~ Ring contains at least two P atoms (9/6581D; 9/6587; 9/659; 9/6593)

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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  DF  .~ 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}
35.~.~.~ Ring contains at least two P atoms (9/6581D; 9/6587; 9/659; 9/6593)

DEFINITION

Classification: 987/35

Ring contains at least two P atoms (9/6581D; 9/6587; 9/659; 9/6593):

(under subclass 34) Subject matter wherein the ring contains at least two phosphorus atoms.