Hierarchy/Derived subclasses
| D4 / 199 |
uspto searches
Patent Apps in D4/199Granted Patents in D4/199
Use the links above or do an advanced search in ppubs for:
(D4/199.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.