Hierarchy/Derived subclasses
257 / 213 | -> 215 | -> 235 | -> 236 | -> 237 |
uspto searches
Patent Apps in 257/236Granted Patents in 257/236
Use the links above or do an advanced search in ppubs for:
(257/236.ccls. or 257/237.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.