US PATENT SUBCLASS 549 / 332
.~.~.~.~.~ The spiro includes a three- or four-membered hetero ring

Current as of: June, 1999
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549 /   HD   ORGANIC COMPOUNDS -- PART OF THE CLASS 532-570 SERIES

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
*  DD  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM, OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS (Class 540, subclass 1) {2}
200  DF  .~.~ Oxygen containing hetero ring (e.g., dioxirane, etc.) {16}
330  DF  .~.~.~ Spiro {1}
331  DF  .~.~.~.~ The spiro includes a hetero ring {4}
332.~.~.~.~.~ The spiro includes a three- or four-membered hetero ring

DEFINITION

Classification: 549/332

(under subclass 331) Compounds wherein at least one of the rings in the spiro ring system is a three- or four-membered oxygen containing hetero ring.

(1) Note. Examples of compounds provided for herein are: [figure] [figure]