Hierarchy/Derived subclasses
| 177 / 201 | -> 216 | -> 220 | -> 221 | |
| -> 222 | -> 223 |
uspto searches
Patent Apps in 177/220Granted Patents in 177/220
Use the links above or do an advanced search in ppubs for:
(177/220.ccls. or 177/221.ccls. or 177/222.ccls. or 177/223.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.