Hierarchy/Derived subclasses
| 29 / 91 | -> 91.2 | -> 91.4 |
uspto searches
Patent Apps in 29/91.4Granted Patents in 29/91.4
Use the links above or do an advanced search in ppubs for:
(29/91.4.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.