Hierarchy/Derived subclasses
| D3 / 1 | -> 4 |
uspto searches
Patent Apps in D3/4Granted Patents in D3/4
Use the links above or do an advanced search in ppubs for:
(D3/4.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.