Hierarchy/Derived subclasses
| 29 / 20 |
uspto searches
Patent Apps in 29/20Granted Patents in 29/20
Use the links above or do an advanced search in ppubs for:
(29/20.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.