Hierarchy/Derived subclasses
| 201 / 21 | -> 22 |
| -> 23 | |
| -> 24 |
uspto searches
Patent Apps in 201/21Granted Patents in 201/21
Use the links above or do an advanced search in ppubs for:
(201/21.ccls. or 201/22.ccls. or 201/23.ccls. or 201/24.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.