Hierarchy/Derived subclasses
| 220 / 200 | -> 201 |
uspto searches
Patent Apps in 220/201Granted Patents in 220/201
Use the links above or do an advanced search in ppubs for:
(220/201.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.