Hierarchy/Derived subclasses
| 312 / 400 | -> 401 | -> 404 |
uspto searches
Patent Apps in 312/404Granted Patents in 312/404
Use the links above or do an advanced search in ppubs for:
(312/404.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.