Hierarchy/Derived subclasses
| 352 / 1 | -> 12 | -> 21 |
uspto searches
Patent Apps in 352/21Granted Patents in 352/21
Use the links above or do an advanced search in ppubs for:
(352/21.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.