Hierarchy/Derived subclasses
| 220 / 581 | -> 586 | -> 587 |
uspto searches
Patent Apps in 220/587Granted Patents in 220/587
Use the links above or do an advanced search in ppubs for:
(220/587.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.