Hierarchy/Derived subclasses
| 144 / 90.1 | -> 91.2 |
uspto searches
Patent Apps in 144/91.2Granted Patents in 144/91.2
Use the links above or do an advanced search in ppubs for:
(144/91.2.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.