Hierarchy/Derived subclasses
| 222 / 173 | -> 180 | -> 181.1 | -> 181.2 |
| -> 181.3 |
uspto searches
Patent Apps in 222/181.1Granted Patents in 222/181.1
Use the links above or do an advanced search in ppubs for:
(222/181.1.ccls. or 222/181.2.ccls. or 222/181.3.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.