Hierarchy/Derived subclasses
| 404 / 83 | -> 90 | -> 91 |
uspto searches
Patent Apps in 404/90Granted Patents in 404/90
Use the links above or do an advanced search in ppubs for:
(404/90.ccls. or 404/91.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.