Hierarchy/Derived subclasses
| 81 / 9.4 | -> 9.44 |
uspto searches
Patent Apps in 81/9.44Granted Patents in 81/9.44
Use the links above or do an advanced search in ppubs for:
(81/9.44.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.