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 (200) hetero ring is four-membered containing nitrogen and having chalcogen double bonded directly to a ring carbon which is adjacent to the ring nitrogen (203) polycyclo ring system containing the hetero ring as one of the cyclos (205) the ring nitrogen is shared by a six-membered ring

Hierarchy/Derived subclasses

540 / 1-> 200-> 203-> 205-> 214-> 215-> 216
      -> 217
      -> 218
      -> 219
      -> 220
      -> 221
      -> 222-> 223
       -> 224-> 225
       -> 226-> 227
       -> 228
      -> 229
      -> 230
    -> 300-> 301

uspto searches

Patent Apps in 540/205

Granted Patents in 540/205

Use the links above or do an advanced search in ppubs for:
(540/205.ccls. or 540/214.ccls. or 540/215.ccls. or 540/216.ccls. or 540/217.ccls. or 540/218.ccls. or 540/219.ccls. or 540/220.ccls. or 540/221.ccls. or 540/222.ccls. or 540/223.ccls. or 540/224.ccls. or 540/225.ccls. or 540/226.ccls. or 540/227.ccls. or 540/228.ccls. or 540/229.ccls. or 540/230.ccls. or 540/300.ccls. or 540/301.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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