Hierarchy/Derived subclasses
| 438 / 133 | -> 135 | -> 136 | -> 137 |
| -> 138 |
uspto searches
Patent Apps in 438/135Granted Patents in 438/135
Use the links above or do an advanced search in ppubs for:
(438/135.ccls. or 438/136.ccls. or 438/137.ccls. or 438/138.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.