US PATENT SUBCLASS 540 / 145
.~.~ Porphyrins (including hydrogenated; e.g., chlorophyll, etc.)


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

*  DD  ORGANIC COMPOUNDS (Class 532, Subclass 1) {1}
1  DF  .~ HETEROCYCLIC CARBON COMPOUNDS CONTAINING A HETERO RING HAVING CHALCOGEN (I.E., OXYGEN, SULFUR, SELENIUM OR TELLURIUM) OR NITROGEN AS THE ONLY RING HETERO ATOMS {6}
145.~.~ Porphyrins (including hydrogenated; e.g., chlorophyll, etc.)


DEFINITION

Classification: 540/145

(under subclass 1) Compounds which have the following basic structure, which may contain double bonds between ring members: [figure]

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

[figure]