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)
Subclass of:
544 - Organic compounds -- part of the class 532-570 series
544000000 - ORGANIC COMPOUNDS (CLASS 532, SUBCLASS 1)
Patent class list (only not empty are listed)
Deeper subclasses:
Class / Patent application number | Description | Number of patent applications / Date published |
---|---|---|
544001000 | Hetero ring is six-membered having two or more ring hetero atoms of which at least one is nitrogen (e.g., selenazines, etc.) | 2533 |