| 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 | DF | .~.~ Azaporphyrins {1} |
| 122 | DF | .~.~.~ Phthalocyanines {8} |
| 139 | DF | .~.~.~.~ Metal containing {1} |
| 140 |  | .~.~.~.~.~ Heavy metal or aluminum containing {2} |
| 141 | DF | .~.~.~.~.~.~> Specified crystalline form or processes of milling (e.g., alpha crystalline form, ball milling, acid milling, etc.) |
| 142 | DF | .~.~.~.~.~.~> Processes of forming the phthalocyanine ring system {2} |