Hierarchy/Derived subclasses
| 235 / 419 | -> 428 |
uspto searches
Patent Apps in 235/428Granted Patents in 235/428
Use the links above or do an advanced search in ppubs for:
(235/428.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.