Hierarchy/Derived subclasses
| 81 / 3.5 | -> 3.6 |
uspto searches
Patent Apps in 81/3.5Granted Patents in 81/3.5
Use the links above or do an advanced search in ppubs for:
(81/3.5.ccls. or 81/3.6.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.