Hierarchy/Derived subclasses
D21 / 300 | -> 369 | -> 371 | -> 374 | -> 375 |
uspto searches
Patent Apps in D21/375Granted Patents in D21/375
Use the links above or do an advanced search in ppubs for:
(D21/375.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.