Hierarchy/Derived subclasses
| 131 / 290 | -> 300 | -> 309 | -> 310 |
uspto searches
Patent Apps in 131/309Granted Patents in 131/309
Use the links above or do an advanced search in ppubs for:
(131/309.ccls. or 131/310.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.