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:
549 - Organic compounds -- part of the class 532-570 series
549000000 - 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 |
---|---|---|
549200000 | Oxygen containing hetero ring (e.g., dioxirane, etc.) | 1954 |
549001000 | Sulfur containing hetero ring (e.g., thiiranes, etc.) | 311 |