Hierarchy/Derived subclasses
| 248 / 637 | -> 646 | -> 669 |
uspto searches
Patent Apps in 248/669Granted Patents in 248/669
Use the links above or do an advanced search in ppubs for:
(248/669.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.