US PATENT SUBCLASS 987 / 66
.~.~.~ Ring contains exactly six atoms (9/6533; 9/6533V)


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}
65  DF  .~.~ Ring contains N and O only, or may include in addition to the required N and O, only C (9/6527; 9/653; 9/653V) {1}
66.~.~.~ Ring contains exactly six atoms (9/6533; 9/6533V)


DEFINITION

Classification: 987/66

Ring contains exactly six atoms (9/6533; 9/6533V):

(under subclass 65) Subject matter wherein the ring contains exactly six atoms.