US PATENT SUBCLASS 987 / 58
.~.~ Ring contains O only, or may include in addition to the required O, only C, S, Se, or Te (9/655)

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}
49  DF  .~ Ring is devoid of a P or a metal atom and contains at least one hereto atom (O, S, N, Se, or Te) and may or may not contain C (9/547; 9/6524) {9}
58.~.~ Ring contains O only, or may include in addition to the required O, only C, S, Se, or Te (9/655) {2}
59  DF  .~.~.~> Three-membered ring containing one O and two C's (9/655J; 9/655J38)
60  DF  .~.~.~> Ring is condensed or bridged to a carbocyclic ring system (9/655V)

DEFINITION

Classification: 987/58

Ring contains O only, or may include in addition to the required O, only C, S, Se, or Te (9/655):

(under subclass 49) Subject matter wherein the phosphorus

compound contains at least one ring which contains only oxygen and carbon atoms, or oxygen and carbon and additional atoms of only sulfur, selenium, or tellurium.