US PATENT SUBCLASS 987 / 45
.~.~.~.~ P atom bonded to C is bonded to an O atom which is in the same ring as P (9/6571L2; 9/6571L6)

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}
43  DF  .~.~.~ Contains P and O as ring atoms and wherein the P atom is directly bonded to a C atom (9/6571L) {2}
45.~.~.~.~ P atom bonded to C is bonded to an O atom which is in the same ring as P (9/6571L2; 9/6571L6)

DEFINITION

Classification: 987/45

P atom bonded to C is bonded to an O atom which is in the same ring as P (9/6571L2; 9/6571L6):

(under subclass 43) Subject matter wherein the ring phosphorus atom is bonded directly to a single ring oxygen atom.