Description: 540 organic compounds -- part of the class 532-570 series / 540 organic compounds -- part of the class 532-570 series/() organic compounds (class 532, subclass 1) (1) heterocyclic carbon compounds containing a hetero ring having chalcogen (i.e., oxygen, sulfur, selenium or tellurium) or nitrogen as the only ring hetero atoms (2) cyclopentanohydrophenanthrene ring system containing (107) nitrogen containing hetero ring attached indirectly to the cyclopentanohydrophenanthrene ring system by nonionic bonding (109) the hetero ring is in the 17-position substituent of the cyclopentanohydrophenanthrene ring system
Hierarchy/Derived subclasses
uspto searches
Patent Apps in 540/109
Granted Patents in 540/109
Use the links above or do an advanced search in
ppubs for:
(540/109.ccls. or 540/110.ccls. or 540/111.ccls. or 540/112.ccls.)
This will show what classes derive from the input. Ex: entering 43/42.24 shows the derived classes and the search that can be used to find
patents or patent applications in those subclasses.