Hierarchy/Derived subclasses
D21 / 398 | -> 483 | -> 484 | -> 500 | -> 501 |
uspto searches
Patent Apps in D21/500Granted Patents in D21/500
Use the links above or do an advanced search in ppubs for:
(D21/500.ccls. or D21/501.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.