Hierarchy/Derived subclasses
| 172 / 19 | -> 20 |
uspto searches
Patent Apps in 172/20Granted Patents in 172/20
Use the links above or do an advanced search in ppubs for:
(172/20.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.