Hierarchy/Derived subclasses
| 404 / 71 |
uspto searches
Patent Apps in 404/71Granted Patents in 404/71
Use the links above or do an advanced search in ppubs for:
(404/71.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.