Hierarchy/Derived subclasses
| 336 / 209 |
uspto searches
Patent Apps in 336/209Granted Patents in 336/209
Use the links above or do an advanced search in ppubs for:
(336/209.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.