US PATENT SUBCLASS 987 / 40
.~.~.~.~ Two or more rings contain at least one P(O) group and wherein at least two P atoms in the two rings are bonded solely to O, or wherein the compound contains two P atoms in a single ring and all bonds of the P atoms are to O (includes spiro rings) (9/6574A6)

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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}
37  DF  .~.~ Ring contains O and P only, or may include in addition to the required O and P, only C (9/6571) {5}
39  DF  .~.~.~ Ring contains a P(O) group as atoms within the ring and wherein all atoms bonded to the P atom within the ring, or extracyclic to the ring, are oxygen (9/6574; 9/6574A1) {2}
40.~.~.~.~ Two or more rings contain at least one P(O) group and wherein at least two P atoms in the two rings are bonded solely to O, or wherein the compound contains two P atoms in a single ring and all bonds of the P atoms are to O (includes spiro rings) (9/6574A6)

DEFINITION

Classification: 987/40

Two or more rings contain at least one P(O) group and wherein at least two P atoms in the two rings are bonded solely to O, or wherein the compound contains two P atoms in a single ring and all bonds of the P atoms are to O (includes spiro rings) (9/6574A6):

(under subclass 39) Subject matter wherein (a) the compound contains at least two phosphorus atoms in different rings and the two phosphorus atoms are bonded solely to oxygen or (b) wherein a single ring contains at least two phosphorus atoms and all bonds to at least two of the phosphorus atoms are solely to oxygen.