US PATENT SUBCLASS 987 / 37
.~.~ Ring contains O and P only, or may include in addition to the required O and P, only C (9/6571)

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.~.~ Ring contains O and P only, or may include in addition to the required O and P, only C (9/6571) {5}
38  DF  .~.~.~> P in ring is directly bonded to at least two O atoms which are in separate rings (9/6571A8; 9/6574A8)
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}
42  DF  .~.~.~> Contains P(O) group as atoms in the ring and wherein the P atom is directly bonded to N (9/6571B)
43  DF  .~.~.~> Contains P and O as ring atoms and wherein the P atom is directly bonded to a C atom (9/6571L) {2}
46  DF  .~.~.~> Contains P(O) group as ring atoms and wherein the P atom is directly bonded to extracyclic S (9/6571A; 9/6571A1) {2}

DEFINITION

Classification: 987/37

Ring contains O and P only, or may include in addition to the required O and P, only C (9/6571):

(under subclass 33) Subject matter wherein the ring contains only phosphorus and oxygen atoms or phosphorus and oxygen and additional atoms only of carbon.