Hierarchy/Derived subclasses
| 439 / 190 | -> 199 | -> 204 |
uspto searches
Patent Apps in 439/204Granted Patents in 439/204
Use the links above or do an advanced search in ppubs for:
(439/204.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.