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 (450) the hetero ring contains at least eight members including nitrogen and carbon (451) chalcogen double bonded directly to a ring carbon of the hetero ring which is adjacent to the ring nitrogen (e.g., laurolactam, etc.) (454) chalcogen in the hetero ring
Hierarchy/Derived subclasses
uspto searches
Patent Apps in 540/454
Granted Patents in 540/454
Use the links above or do an advanced search in
ppubs for:
(540/454.ccls. or 540/455.ccls. or 540/456.ccls. or 540/457.ccls. or 540/458.ccls. or 540/459.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.