Hierarchy/Derived subclasses
74 / 840 | -> 25 | -> 52 |
uspto searches
Patent Apps in 74/52Granted Patents in 74/52
Use the links above or do an advanced search in ppubs for:
(74/52.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.