Hierarchy/Derived subclasses
| 53 / 509 |
uspto searches
Patent Apps in 53/509Granted Patents in 53/509
Use the links above or do an advanced search in ppubs for:
(53/509.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.