Hierarchy/Derived subclasses
| 81 / 52 | -> 54 | -> 57 | -> 57.15 | -> 57.19 |
uspto searches
Patent Apps in 81/57.19Granted Patents in 81/57.19
Use the links above or do an advanced search in ppubs for:
(81/57.19.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.