Hierarchy/Derived subclasses
| 454 / 69 | -> 83 | -> 88 | -> 90 | -> 91 |
uspto searches
Patent Apps in 454/91Granted Patents in 454/91
Use the links above or do an advanced search in ppubs for:
(454/91.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.