Hierarchy/Derived subclasses
217 / 3r | -> 3c |
uspto searches
Patent Apps in 217/3cGranted Patents in 217/3c
Use the links above or do an advanced search in ppubs for:
(217/3c.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.