Hierarchy/Derived subclasses
213 / 75r | -> 77 | -> 100r | -> 104 | -> 109 | -> 115 | -> 131 | -> 137 | -> 138 |
uspto searches
Patent Apps in 213/137Granted Patents in 213/137
Use the links above or do an advanced search in ppubs for:
(213/137.ccls. or 213/138.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.