Hierarchy/Derived subclasses
720 / 658 | -> 659 | -> 661 |
uspto searches
Patent Apps in 720/661Granted Patents in 720/661
Use the links above or do an advanced search in ppubs for:
(720/661.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.