Hierarchy/Derived subclasses
257 / 213 | -> 215 | -> 225 | -> 231 | -> 232 |
-> 233 |
uspto searches
Patent Apps in 257/231Granted Patents in 257/231
Use the links above or do an advanced search in ppubs for:
(257/231.ccls. or 257/232.ccls. or 257/233.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.