Hierarchy/Derived subclasses
| 303 / 28 | -> 31 |
uspto searches
Patent Apps in 303/31Granted Patents in 303/31
Use the links above or do an advanced search in ppubs for:
(303/31.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.