US PATENT SUBCLASS 549 / 389
.~.~.~.~.~.~.~ Naphtho-pyrans (including hydrogenated)

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}
356  DF  .~.~.~ The hetero ring is six-membered {9}
381  DF  .~.~.~.~ Polycyclo ring system having the hetero ring as one of the cyclos {4}
385  DF  .~.~.~.~.~ Tricyclo ring system having the hetero ring as one of the cyclos {4}
388  DF  .~.~.~.~.~.~ The tricyclo ring system consists of three six-membered cyclos (e.g., xanthene, etc.) {4}
389.~.~.~.~.~.~.~ Naphtho-pyrans (including hydrogenated)

DEFINITION

Classification: 549/389

(under subclass 388) Compounds wherein the tricyclo ring system consists of a naphthalene ring system, which may be hydrogenated, sharing two adjacent carbons with the six-membered hetero ring.

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