US PATENT SUBCLASS 987 / 39
.~.~.~ 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)

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}
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.~.~.~ 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  DF  .~.~.~.~> 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)
41  DF  .~.~.~.~> P(O) group containing ring is part of a condensed or bridged carbocyclic ring system (9/6574A4)

DEFINITION

Classification: 987/39

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):

(under subclass 37) Subject matter wherein the phosphorus in the ring is bonded solely to oxygen atoms in the ring and solely to oxygen atoms extracyclic to the ring.