Hierarchy/Derived subclasses
D21 / 300 | -> 324 | -> 325 | -> 326 |
-> 327 |
uspto searches
Patent Apps in D21/325Granted Patents in D21/325
Use the links above or do an advanced search in ppubs for:
(D21/325.ccls. or D21/326.ccls. or D21/327.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.