Hierarchy/Derived subclasses
| 312 / 21 | -> 27 | -> 28 |
uspto searches
Patent Apps in 312/27Granted Patents in 312/27
Use the links above or do an advanced search in ppubs for:
(312/27.ccls. or 312/28.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.