Hierarchy/Derived subclasses
74 / 840 | -> 89 | -> 89.2 | -> 89.22 |
uspto searches
Patent Apps in 74/89.22Granted Patents in 74/89.22
Use the links above or do an advanced search in ppubs for:
(74/89.22.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.