Hierarchy/Derived subclasses
91 / 472 | -> 499 | -> 504 | -> 505 | -> 506 |
uspto searches
Patent Apps in 91/504Granted Patents in 91/504
Use the links above or do an advanced search in ppubs for:
(91/504.ccls. or 91/505.ccls. or 91/506.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.