Hierarchy/Derived subclasses
| 451 / 64 | -> 177 | -> 178 | -> 212 | -> 213 | -> 216 | -> 217 |
uspto searches
Patent Apps in 451/216Granted Patents in 451/216
Use the links above or do an advanced search in ppubs for:
(451/216.ccls. or 451/217.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.