Hierarchy/Derived subclasses
| D28 / 99 |
uspto searches
Patent Apps in D28/99Granted Patents in D28/99
Use the links above or do an advanced search in ppubs for:
(D28/99.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.