Hierarchy/Derived subclasses
| 420 / 417 | -> 418 | -> 419 |
uspto searches
Patent Apps in 420/419Granted Patents in 420/419
Use the links above or do an advanced search in ppubs for:
(420/419.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.