US PATENT SUBCLASS 987 / 108
.~.~.~ Three-membered ring containing a single N atom (9/564)


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}
90  DF  .~.~ Single N as only hetero atom in ring (9/553; 9/568) {6}
108.~.~.~ Three-membered ring containing a single N atom (9/564)


DEFINITION

Classification: 987/108

Three-membered ring containing a single N atom (9/564):

(under subclass 90) Subject matter wherein the phosphorus compound contains at least one three membered hetero ring containing a single nitrogen and two carbon atoms, e.g., ethyleneimine ring system, etc.