Hierarchy/Derived subclasses
| 213 / 224 |
uspto searches
Patent Apps in 213/224Granted Patents in 213/224
Use the links above or do an advanced search in ppubs for:
(213/224.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.