Hierarchy/Derived subclasses
180 / 7.1 | -> 9 | -> 9.1 | -> 9.26 | -> 9.28 | -> 9.3 |
uspto searches
Patent Apps in 180/9.28Granted Patents in 180/9.28
Use the links above or do an advanced search in ppubs for:
(180/9.28.ccls. or 180/9.3.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.