Hierarchy/Derived subclasses
71 / 900 |
uspto searches
Patent Apps in 71/900Granted Patents in 71/900
Use the links above or do an advanced search in ppubs for:
(71/900.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.