Hierarchy/Derived subclasses
521 / 919 |
uspto searches
Patent Apps in 521/919Granted Patents in 521/919
Use the links above or do an advanced search in ppubs for:
(521/919.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.