USPC Class Details

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 (121) azaporphyrins

Hierarchy/Derived subclasses

540 / 1-> 121-> 122-> 123-> 124-> 125-> 126
    -> 127
   -> 128
   -> 129
   -> 130
   -> 131-> 132
    -> 133-> 134
   -> 135
   -> 136-> 137
    -> 138
   -> 139-> 140-> 141
     -> 142-> 143
      -> 144

uspto searches

Patent Apps in 540/121

Granted Patents in 540/121

Use the links above or do an advanced search in ppubs for:
(540/121.ccls. or 540/122.ccls. or 540/123.ccls. or 540/124.ccls. or 540/125.ccls. or 540/126.ccls. or 540/127.ccls. or 540/128.ccls. or 540/129.ccls. or 540/130.ccls. or 540/131.ccls. or 540/132.ccls. or 540/133.ccls. or 540/134.ccls. or 540/135.ccls. or 540/136.ccls. or 540/137.ccls. or 540/138.ccls. or 540/139.ccls. or 540/140.ccls. or 540/141.ccls. or 540/142.ccls. or 540/143.ccls. or 540/144.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.
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