Hierarchy/Derived subclasses
| 131 / 280 | -> 281 |
uspto searches
Patent Apps in 131/281Granted Patents in 131/281
Use the links above or do an advanced search in ppubs for:
(131/281.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.