Hierarchy/Derived subclasses
| 451 / 1 | -> 2 | -> 3 |
uspto searches
Patent Apps in 451/3Granted Patents in 451/3
Use the links above or do an advanced search in ppubs for:
(451/3.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.