Hierarchy/Derived subclasses
| 48 / 4 | -> 19 | -> 20 |
| -> 21 | ||
| -> 22 |
uspto searches
Patent Apps in 48/19Granted Patents in 48/19
Use the links above or do an advanced search in ppubs for:
(48/19.ccls. or 48/20.ccls. or 48/21.ccls. or 48/22.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.