Hierarchy/Derived subclasses
| 451 / 64 | -> 75 | -> 90 |
uspto searches
Patent Apps in 451/90Granted Patents in 451/90
Use the links above or do an advanced search in ppubs for:
(451/90.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.