Hierarchy/Derived subclasses
| 454 / 168 | -> 169 | -> 170 |
| -> 171 | ||
| -> 172 |
uspto searches
Patent Apps in 454/168Granted Patents in 454/168
Use the links above or do an advanced search in ppubs for:
(454/168.ccls. or 454/169.ccls. or 454/170.ccls. or 454/171.ccls. or 454/172.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.