Hierarchy/Derived subclasses
236 / 20r | -> 21r | -> 21b |
uspto searches
Patent Apps in 236/21RGranted Patents in 236/21R
Use the links above or do an advanced search in ppubs for:
()
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.