Hierarchy/Derived subclasses
| 420 / 1 | -> 2 | -> 3 |
uspto searches
Patent Apps in 420/2Granted Patents in 420/2
Use the links above or do an advanced search in ppubs for:
(420/2.ccls. or 420/3.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.