Hierarchy/Derived subclasses
| 438 / 128 | -> 129 |
| -> 130 | |
| -> 131 | |
| -> 132 |
uspto searches
Patent Apps in 438/128Granted Patents in 438/128
Use the links above or do an advanced search in ppubs for:
(438/128.ccls. or 438/129.ccls. or 438/130.ccls. or 438/131.ccls. or 438/132.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.