Hierarchy/Derived subclasses
| 74 / 2 | -> 3.5 | -> 3.52 | |
| -> 3.54 | -> 3.56 |
uspto searches
Patent Apps in 74/3.5Granted Patents in 74/3.5
Use the links above or do an advanced search in ppubs for:
(74/3.5.ccls. or 74/3.52.ccls. or 74/3.54.ccls. or 74/3.56.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.