Hierarchy/Derived subclasses
| D28 / 4 | -> 7 | -> 2 | -> 8 | -> 13 |
uspto searches
Patent Apps in D28/7Granted Patents in D28/7
Use the links above or do an advanced search in ppubs for:
(D28/7.ccls. or D28/2.ccls. or D28/8.ccls. or D28/13.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.