Hierarchy/Derived subclasses
| 270 / 1.01 | -> 20.1 | -> 21.1 |
uspto searches
Patent Apps in 270/20.1Granted Patents in 270/20.1
Use the links above or do an advanced search in ppubs for:
(270/20.1.ccls. or 270/21.1.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.