Hierarchy/Derived subclasses
| 131 / 290 | -> 291 | -> 292 |
| -> 293 | ||
| -> 294 | ||
| -> 295 | ||
| -> 296 |
uspto searches
Patent Apps in 131/291Granted Patents in 131/291
Use the links above or do an advanced search in ppubs for:
(131/291.ccls. or 131/292.ccls. or 131/293.ccls. or 131/294.ccls. or 131/295.ccls. or 131/296.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.