US PATENT SUBCLASS 987 / 65
.~.~ 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)

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.~.~ 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  DF  .~.~.~> Ring contains exactly six atoms (9/6533; 9/6533V)

DEFINITION

Classification: 987/65

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):

(under subclass 49) Subject matter wherein the ring contains (a) only atoms of nitrogen and oxygen or (b) only atoms of nitrogen, oxygen, and carbon.