Hierarchy/Derived subclasses
| 474 / 91 |
uspto searches
Patent Apps in 474/91Granted Patents in 474/91
Use the links above or do an advanced search in ppubs for:
(474/91.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.