Hierarchy/Derived subclasses
| 91 / 418 | -> 461 | -> 304 |
uspto searches
Patent Apps in 91/461Granted Patents in 91/461
Use the links above or do an advanced search in ppubs for:
(91/461.ccls. or 91/304.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.