Hierarchy/Derived subclasses
| 235 / 435 | -> 439 | -> 441 | -> 442 | -> 443 |
uspto searches
Patent Apps in 235/441Granted Patents in 235/441
Use the links above or do an advanced search in ppubs for:
(235/441.ccls. or 235/442.ccls. or 235/443.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.