Hierarchy/Derived subclasses
| 99 / 324 | -> 325 | -> 331 | -> 332 | -> 333 |
uspto searches
Patent Apps in 99/331Granted Patents in 99/331
Use the links above or do an advanced search in ppubs for:
(99/331.ccls. or 99/332.ccls. or 99/333.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.