Hierarchy/Derived subclasses
| 501 / 1 | -> 87 | -> 88 | -> 89 |
uspto searches
Patent Apps in 501/89Granted Patents in 501/89
Use the links above or do an advanced search in ppubs for:
(501/89.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.