Hierarchy/Derived subclasses
| 131 / 274 | -> 275 | ||
| -> 276 | -> 277 | -> 278 | |
| -> 279 |
uspto searches
Patent Apps in 131/274Granted Patents in 131/274
Use the links above or do an advanced search in ppubs for:
(131/274.ccls. or 131/275.ccls. or 131/276.ccls. or 131/277.ccls. or 131/278.ccls. or 131/279.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.