Hierarchy/Derived subclasses
| 338 / 226 | -> 228 |
uspto searches
Patent Apps in 338/228Granted Patents in 338/228
Use the links above or do an advanced search in ppubs for:
(338/228.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.