Hierarchy/Derived subclasses
| 217 / 3r | -> 3c |
uspto searches
Patent Apps in 217/3CGranted Patents in 217/3C
Use the links above or do an advanced search in ppubs for:
()
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.