US PATENT SUBCLASS 987 / 60
.~.~.~ Ring is condensed or bridged to a carbocyclic ring system (9/655V)


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  DF  .~.~ Ring contains O only, or may include in addition to the required O, only C, S, Se, or Te (9/655) {2}
60.~.~.~ Ring is condensed or bridged to a carbocyclic ring system (9/655V)


DEFINITION

Classification: 987/60

Ring is condensed or bridged to a carbocyclic ring system (9/655V):

(under subclass 58) Subject matter wherein the ring containing the oxygen atom shares at least two of its carbon atoms with a ring system containing only carbon atoms.