Hierarchy/Derived subclasses
D21 / 398 | -> 436 | -> 441 | -> 443 | -> 444 |
uspto searches
Patent Apps in D21/443Granted Patents in D21/443
Use the links above or do an advanced search in ppubs for:
(D21/443.ccls. or D21/444.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.