Hierarchy/Derived subclasses
| 271 / 8.1 | -> 18 | -> 42 | -> 131 | -> 139 | -> 140 |
uspto searches
Patent Apps in 271/140Granted Patents in 271/140
Use the links above or do an advanced search in ppubs for:
(271/140.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.