US PATENT SUBCLASS 540 / 121
.~.~ Azaporphyrins

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}
121.~.~ Azaporphyrins {1}
122  DF  .~.~.~> Phthalocyanines {8}

DEFINITION

Classification: 540/121

(under subclass 1) Compounds characterized by the following basic structure, illustrated below, which may contain double bonds between ring members and wherein X is nitrogen or carbon, at least one X is nitrogen. [figure]

(1) Note. An example of a compound provided for herein is: [figure]