Hierarchy/Derived subclasses
| 68 / 3r | -> 131 | -> 132 | -> 133 |
| -> 134 |
uspto searches
Patent Apps in 68/131Granted Patents in 68/131
Use the links above or do an advanced search in ppubs for:
(68/131.ccls. or 68/132.ccls. or 68/133.ccls. or 68/134.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.