Hierarchy/Derived subclasses
| 68 / 3r | -> 13r | -> 19 | -> 23r | -> 23.1 | -> 23.2 |
| -> 23.3 |
uspto searches
Patent Apps in 68/23.1Granted Patents in 68/23.1
Use the links above or do an advanced search in ppubs for:
(68/23.1.ccls. or 68/23.2.ccls. or 68/23.3.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.