Hierarchy/Derived subclasses
| 454 / 237 | -> 251 | -> 252 |
| -> 253 |
uspto searches
Patent Apps in 454/251Granted Patents in 454/251
Use the links above or do an advanced search in ppubs for:
(454/251.ccls. or 454/252.ccls. or 454/253.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.